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Smolders, E. A. A., A. Steg y V. A. Hindle. "Organic matter digestibility in horses and its prediction." Netherlands Journal of Agricultural Science 38, n.º 3B (1 de septiembre de 1990): 435–47. http://dx.doi.org/10.18174/njas.v38i3b.16569.
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Organic matter (OM) digestibility of 53 feeds was estimated in horses, sheep and in vitro using rumen fluid. Feeds tested were: roughages (grass hay, fresh grass, wilted grass silage, forage maize and artificially dried roughage), compound feeds and compound feed ingredients including cereals. Technical merits of the chosen procedure for digestibility trials with horses are discussed. Horse digestibility data for forages were consistently lower than sheep data, with a variable fibre level effect. For compound feeds and compound feed ingredients horse digestibility was about comparable to sheep digestibility allowing for considerable differences between feeds. In vitro digestibility gave a reliable estimation of OM digestibility in horses for the different group of feeds. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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Cooper, S. D. B., I. Kyrizakis y J. V. Nolan. "Diet selection in sheep: The role of the rumen environment in the selection of a diet from two feeds that differ in their energy density". British Journal of Nutrition 74, n.º 1 (julio de 1995): 39–54. http://dx.doi.org/10.1079/bjn19950105.
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The effect of the energy density (ED) of feeds offered as a choice on the diet selection of sheep, and the relationship between the rumen environment and the diet selected from feeds of different ED were investigated in two experiments. In the first experiment two feeds, L and H, and their mixture M (3:1 w/w) were formulated. All feeds had similar calculated metabolizable protein: metabolizable energy (ME) ratios, but differed in ED (7·4, 8·1 and 10·1 MJ ME$sol;kg fresh feed for L, M and H respectively). The feeds were offered ad lib. either singly or in paired choices (L/M, L/H and M/H; n6 per treatment) to growing sheep. Although the rate of live-weight (Lwt) gain on feed H was higher than on feeds L or M, and the daily rate of feed intake lower, the sheep on feed choices did not consume only feed H. Instead they selected a mixture of both feeds offered, such that the total amount of H consumed per kg fresh feed was similar on choices L/H and M/H. The rate of Lwt gain of sheep on choices L/H and M/H was not different from that achieved on feed H alone. In the second experiment the choice L/H was offered to fistulated sheep (10 months of age, mean Lwt 57·5 kg) in an 8×8 Latin square, with 7 d periods. Treatments were infusions into the rumen (total volume 1 litre) over 4 h on days 1–4 of each period of acid (HC1; Acid 1, 400; Acid 2, 300 and Acid 3, 200 mmol/l), alkali (NaOH; Alk 1, 316; Alk 2, 212 and Alk 3, 109 mmol/l) and control (NaCl; Con 1, 315 and Con 2, 209 mmol/l). Infusate osmolalities (mOs/kg) were 795 (Acid 1), 585 (Acid 2, Alk 1 and Con 1), 390 (Acid 3, Alk 2 and Con 2) and 200 (Alk 3). Infusion treatment significantly affected the diet selection of the sheep (P < 0·05) according to the osmolality of infusate, but not according to rumen pH. During infusions intake of feed H tended to decline with increasing treatment osmolality, whereas intake of L remained constant. The effects on diet selection and feed intake were of a short duration with no carry-over effects. These results show that sheep given a choice between two feeds of different ED select a substantial quantity of the low-ED feed; this diet selection is affected by short-term manipulations of their rumen environment, in a manner that is consistent with the maintenance of effective rumen conditions.
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Chaudhry, Abdul Shakoor y Ruba A. I. Mohamed. "Using fistulated sheep to compare in sacco and in vitro rumen degradation of selected feeds". Animal Production Science 51, n.º 11 (2011): 1015. http://dx.doi.org/10.1071/an10273.
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Despite its beneficial role in almost all feed evaluation systems, the in sacco method is inconsistent and labour intensive in estimating the degradation of ruminant feeds. This study compared a rumen fluid-based in vitro method with the in sacco method to estimate degradation of 12 feeds comprising six concentrates and six grasses representing three fields during two seasons of winter and spring. Three feed groups (n = 4) were formed by using two grasses (one per season) and two concentrates. These feeds were incubated alongside blanks, in duplicate, for various hours either in sacco in three fistulated sheep or in vitro by using rumen fluid from the same sheep over three periods using two separate 3 × 3 Latin square designs. The in sacco and in vitro data were statistically compared for the effects of sheep, feed group and period on degradation at each incubation time within each method. The degradation data were fitted exponentially to derive water soluble (a), insoluble (b) and degradation rate (c) constants to estimate effective degradability at rumen outflow rate of 0.02 (P0.02) for each feed in each method. These values were statistically compared for variations within and between feed types for each method. The sheep, group and period did not differ significantly (P > 0.05) for feed degradation at most incubation times within any of these two methods. The in vitro method was able to mimic the in sacco degradation of feeds, although the absolute in vitro values were always lower than the in sacco values. The higher in sacco degradation for almost all feeds were partly attributed to the much greater losses of these feeds during their washing with water at 0 h. The in vitro method did identify significant differences (P < 0.05) in dry matter or crude protein degradations between and within different concentrates and grasses in parallel to the in sacco method. The ranking of feeds was comparable for these methods. The in vitro method can be used in parallel to the in sacco method to estimate degradation of various feeds. However, there is a need for coordinated studies to improve the prediction ability of the in vitro method for its adoption to routinely estimate the degradation of ruminant feeds.
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Kyriazakis, I. y J. D. Oldham. "Diet selection in sheep: the ability of growing lambs to select a diet that meets their crude protein (nitrogen × 6.25) requirements". British Journal of Nutrition 69, n.º 3 (mayo de 1993): 617–29. http://dx.doi.org/10.1079/bjn19930064.
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To test the proposition that sheep are able to select a diet that meets their crude protein (N × 6.25; CP) requirements, feeds L, A, B, C and H with the same energy content (11 MJ metabolizable energy/kg feed) but different CP contents (78, 109, 141, 172 and 235 g CP/kg fresh feed respectively) were formulated. In addition, feed U, which was feed L plus 21.4 g urea/kg (CP content 132 g/kg), was also made. The feeds were offered ad lib. either singly (n 4 per treatment) or as a choice between feed H and another feed (pairs LH, AH, BH, CH and UH; n 9 per feed pair) to individually penned Suffolk × Scottish mule wether lambs, over the live-weight range 25–45 kg. On the single feeds the rates of live-weight gain were 273, 326, 412, 418, 396 and 407 g/day (SE of difference (SED) 34; P < 0.01) and protein (excluding wool) gain were 27, 32, 44, 45, 41 and 39 g/d (SED 4; P < 0.001) for feeds L, A, B, C, H and U respectively. When sheep were given a choice between a feed below (L or A) and a feed above their CP requirements (H; as judged by the single-feeding treatments) the CP concentration selected was not different between the two pairs: 131 (SE 4) v. 133 (SE 4) g CP/kg feed for pairs LH and AH respectively. On the choices BH and CH (a choice between two feeds above requirements) the feed lower in CP was constantly preferred (874 (SE 33) and 910 (SE 33) g feed B and C respectively per kg total feed intake; CP selected was 157 and 178 g CP/kg respectively). However, this was not the case with the UH choice on which sheep consumed only 599 (SE 61) g feed U/kg total feed intake, resulting in a selection of a higher CP in their diet (173 g CP/kg). The live-weight gains of the animals given a choice between two feeds were 416, 387, 415, 410 and 383 g/d (SED 37) and protein gains were 45, 40, 46, 50 and 43 (SE 7) for pairs LH, AH, BH, CH and UH respectively, which were comparable with the best performance achieved on a single feed. The results suggest that sheep were able to select a diet that meets their CP requirements and avoid, at least to a certain extent, excess of protein intake. It is also possible that sheep discriminate against a property of feed U, such as an excess of urea, when this feed is paired with a feed high in CP.
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Pedernera, Mariana, Alejandra Vulliez y Juan J. Villalba. "PSV-23 The influence of prior experience on dietary diversity in sheep". Journal of Animal Science 98, Supplement_4 (3 de noviembre de 2020): 217–18. http://dx.doi.org/10.1093/jas/skaa278.401.
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Abstract The objective of this study was to explore the influence of prior dietary experiences on intake and selection of novel feeds by lambs. Twenty lambs housed in individual pens were assigned to two groups (10lambs/group): Negative (NE) and Positive (PE) Experiences, in a split-plot design. Lambs were offered a nutritive novel feed followed by intra-ruminal infusions of lithium chloride-LiCl (150 mg/kg BW), a toxicant that causes food aversions (NE), or vehicle (water; PE). The feed was offered daily and infusions were delivered only when intake was ≥50g, when the protocol was repeated with another novel feed until 4 feeds (oats, wheat bran, corn, beep pulp) were offered. After exposure, all lambs were tested for their acceptance of single novel feeds, each offered during 2 consecutive days: sorghum grain, rice bran, Calfmanna® pellets and soybean meal. Subsequently, all lambs were offered a 5-way choice among these feeds and alfalfa (familiar feed). Intake data, preference and Shannon’s diversity index (5-way choices) were analyzed with a Mann-Whiney U test. During exposure, the NE group ate less of the 4 feeds than the PE group (P < 0.05). Moreover, as exposure progressed, it took more days for NE lambs to reach the 50 g intake threshold, suggesting that neophobia in this group increased with negative experiences. During testing, NE lambs ate less (P < 0.05) of the novel feeds, except soybean meal, than the PE lambs. During the 5-way-choice test, preference for alfalfa was 63.6±3.5% for NE and 45.2±2.6% for PE (P < 0.001). The Shannon’s index was 0.85±0.05 for NE and 1.24±0.03 for PE (P < 0.001), suggesting that lambs in NE selected a less diverse diet. Thus, prior experience influenced neophobia and dietary diversity, an outcome that could impact the nutrition and welfare of grazing animals introduced to novel environments and the diversity of plant communities.
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Lawrence, K. "Use of monensin sodium in sheep feeds". Veterinary Record 133, n.º 20 (13 de noviembre de 1993): 508. http://dx.doi.org/10.1136/vr.133.20.508.
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Odoi, F. N. A. y E. Owen. "Offering barley straw to lambs near weaning as a means of increasing their subsequent readiness to eat straw". Proceedings of the British Society of Animal Production (1972) 1992 (marzo de 1992): 169. http://dx.doi.org/10.1017/s0308229600022790.
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Sheep housed after grazing and offered straw as a feed show reluctance to eat for several days. Evidence exists to indicate that eating habits can be manipulated through a learning process, especially if manipulation occurs pre-weaning. Australian research by Arnold and Mailer (1977) with unpalatable pastures, and Green, Elwin, Mottershead, Keogh and Lynch (1984) with whole cereal grain, showed that sheep exposed to these feeds early in life were more willing to accept the feeds later in life than others not exposed.The present experiment investigated whether this observation was applicable to lambs exposed to a poor quality roughage like barley straw.
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Kyriazakis, I., J. D. Oldham, R. L. Coop y F. Jackson. "The effect of subclinical intestinal nematode infection on the diet seletion of growing sheep". British Journal of Nutrition 72, n.º 5 (noviembre de 1994): 665–77. http://dx.doi.org/10.1079/bjn19940070.
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To test the hypothesis that subclinical gastrointestinal parasitism, associated with an impairment in N digestion and metabolism and a reduction in the voluntary feed intake (VFI), could affect the diet selection of sheep given a choice between two feeds that differed in their crude protein (CP) content, twenty-four Texel ×Scottish Blackface ewe lambs growing from 28 to 48 kg live weight (LWT) were given a daily dose of 2500 larvae of the intestinal nematode Trichostrongylus colubriformis; twenty-four similar lambs were used as uninfected controls. Six infected and six control lambs were given a free choice between two pelleted feeds (10·4 MJ metabolizable energy/kg), wilh different CP contents (90 (L) and 214 (H) g CP/kg fresh feed respectively). In addition, eighteen parasitized and eighteen control sheep were given access ad lib. to either feed L, or feed H, or their mixture M (164 g CP/kg; twelve per feed), in order to quantify the effects of the feeds when offered alone, and to test for any interactions between feed CP content and parasitism on the performance of the lambs. Intestinal parasitism reduced significantly (P < 0·001) both the rates of LWT gain (by 30%) and VFI (by 10%). The adult and developing parasitic forms took 4 weeks to establish and develop to a significant adult worm population (as judged by the faecal egg counts and blood variables) and until then there was no effect of parasitism on the performance of the lambs. The diet selection of the lambs given a choice between two feeds was similar between the two groups in the first 4 weeks of the experiment, but differed significantly (P < 0·05) in the second part of the experiment (4th week to the end). Thus, while parasitized lambs had a reduced rate of feed intake, by changing their diet selection they achieved a daily rate of CP intake similar to the control ones. However, since the parasitized lambs had a reduced rate of LWT gain, they also consumed a higher total amount of CP to reach the same LWT. It is concluded that sheep infected daily with a small number of larvae of T. colubriformis and given a choice between two feeds that differ in their protein contents are able to modify their diet selection in order to meet the increased protein requirements resulting from such an infection.
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Hou, X. Z., D. H. Anderson, A. W. Illius, G. C. Emmans y J. D. Oldham. "Long-term patterns of food selection in sheep growing towards maturity". Proceedings of the British Society of Animal Production (1972) 1989 (marzo de 1989): 107. http://dx.doi.org/10.1017/s0308229600010989.
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Previous work at the Edinburgh School of Agriculture has suggested that sheep, like pigs, can select amongst foods which differ in protein:energy content according to their protein needs. The proportion of high protein feed which was selected by young sheep gradually diminished as the animals grew towards maturity over a period of measurement of 10 weeks (Cropper, 1988). The experiment reported here was designed to test this idea further by allowing sheep, initially differing in age and weight, to select between a high and low protein food (both available ad libitum) throughout their growth to a stable mature weight and body composition.Two pelletted feeds were formulated and prepared which differed in protein concentration but with similar calculated energy (metabolisable energy, ME) (Table 1) concentration and abundant in minerals and vitamins. Seven sheep (Suffolk x Greyface wethers) aged 3 months (n = 3), 18 months (n = 2), and 30 months (n = 2) at the start of the experiment were individually penned and given experience of each of the two feeds individually before having ad libitum access to both. Tap water was freely available from a bucket. Voluntary consumption of each feed was recorded daily by weighing and drying refusals. The sheep were weighed weekly and scanned using a Vetscan ultrasonic scanner to estimate fat and muscle depths at the 13th rib on days 126, 225, 336, 436 and 539.
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McDonald, CL, JB Rowe y SP Gittins. "Feeds and feeding methods for assembly of sheep before export". Australian Journal of Experimental Agriculture 34, n.º 5 (1994): 589. http://dx.doi.org/10.1071/ea9940589.
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Sheep are assembled in Australian feedlots before export and given time to adapt to the pelleted diet they will receive on board ship. In Western Australia, lupins are normally included in the diet at levels up to 30% as a source of digestible energy which is low in starch. It is also common to feed hay during assembly. We examine the use of pellets based on barley and containing either lupins or virginiamycin to overcome problems of acidosis, and the importance of hay during assembly. There were 9 dietary treatments each with 3 pens of 30 sheep. The study was conducted over 8 days simulating assembly feedlot conditions. Measurements were made of numbers of sheep visiting troughs (paint-marking technique) and accumulation of lactic acid in the rumen. 'Barley' pellets were formulated with 33% barley, 18% oats, 47% hay/straw and 2% minerals and vitamins. Replacing about half of the barley with lupins resulted in more sheep paint-marked on days 3-6 (P<0.05) and higher levels of feed intake on days 4-8 (P<0.001) than feeding pellets without lupins. The inclusion of lupins was also associated with a less pronounced drop in feed intake on day 4 than measured in sheep fed barley pellets alone. Adding virginiamycin at 40 g/t to the basal barley-based pellet also significantly increased the numbers of sheep paintmarked. Virginiamycin appeared to have a similar effect to the inclusion of lupins in terms of reducing the number of sheep which were not paint-marked. Sprinkling a small quantity of lucerne chaff onto the pellets had no effect on feeding behaviour. The use of hay in racks resulted in fewer sheep (3 v. 12%, P<0.05) not eating during the first 3 days but there was no significant effect thereafter. We concluded that the inclusion of either lupins or virginiamycin is effective in improving the adaptation to cereal-based pellets in export feedlots. The use of hay either in racks or sprinkled over the pellets appears to be of limited value.
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Moss, Angela y D. I. Givens. "Effect of feed type on methane produced by sheep". Proceedings of the British Society of Animal Production (1972) 1990 (marzo de 1990): 28. http://dx.doi.org/10.1017/s0308229600018109.
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The loss of digestible energy from ruminant feeds as methane gas is often assumed to be about 0.08 of gross energy (GE) intake. This represents a significant loss of feed energy and recently concern has been expressed about the importance of methane as a gas which contributes to global warming. As methane is a gaseous loss, its measurement requires specialised equipment. Therefore the metabolisable energy (ME) content of many feedstuffs is estimated using a predicted methane energy loss.
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Chapple, D. G., K. P. A. Wheeler y G. Perrott. "Evaluation of sugar beet feeds and maize distiller's dark grains as supplements for pregnant ewes fed straw-based diets". Proceedings of the British Society of Animal Science 1998 (1998): 102. http://dx.doi.org/10.1017/s0308229600033158.
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The feeding of lowland sheep on straw-based systems during pregnancy was developed at ADAS Rosemaund during the last decade (Davies and Chappie 1995). Results showed that ewe and lamb performance were satisfactory, providing adequate compound supplementation was fed. Whole barley and soya bean meal has been the standard ration, but feeds based on high protein molassed sugar beet feed (Probeet Trident Feed) and maize distiller's dark grains could improve palatability and be easier to feed. The objective of this work was to evaluate the effects on ewe and lamb performance of feeding sugar beet feeds and maize distiller's dark grains to pregnant ewes on a straw-based feeding system.
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Emmans, G. C., M. R. Cropper, W. S. Dingwall, H. Brown, J. D. Oldham y J. I. Harland. "Efficiencies of use of the metabolisable energy from feeds based on barley or sugar beet feed in immature sheep". Proceedings of the British Society of Animal Production (1972) 1989 (marzo de 1989): 60. http://dx.doi.org/10.1017/s0308229600010539.
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The ARC (1980) energy system sees growth in the single dimension of energy retention (ER) which increases, with diminishing marginal efficiency, as ME intake increases. The quantitative relationship between ME intake and ER is predicted from q, the proportion of the gross energy which is metabolisable. An experiment on growing sheep on controlled feeding of different feeds was carried out to provide data suitable for testing ARC (1980) and other energy systems.Scottish Blackface wether sheep in single pens, entered the experiment at 25 kg liveweight (LW), when 11 were slaughtered. The remainder were allocated to 3 x 3 x 3 treatments with an intended 4 replicates per treatment. The factors were (i) feeds: feeds B, U and M shown in Table 1, (ii) levels of feeding. L, M and H where H was 936 g/d at 25 kg and was increased by 52 g/d each week, L was half H and M half-way between L and H, (iii) slaughter point, after 9 or 18 weeks, or at 40 kg liveweight.
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Bailes, K. L., J. W. Piltz y D. M. McNeill. "In vivo digestibility of a range of silages in cattle compared with sheep". Animal Production Science 60, n.º 5 (2020): 635. http://dx.doi.org/10.1071/an19178.
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Context Ensuring accuracy of feed testing is becoming increasingly important as livestock industries seek to maximise efficiency of producing animal products to meet world requirements. Aim Twenty-four silages were fed to sheep and cattle to test the validity of using sheep-derived digestibility estimates for cattle. Method The silages tested included temperate and subtropical forages, and differed in level of maturity and weed contamination at harvest: several of the forage crops were grown with irrigation. In vivo comparisons were made for digestibility of dry matter (DMD), organic matter (OMD), and organic matter in the dry matter (DOMD) across two experiments. Intake was restricted to 16.5 g/kg liveweight and those silages with low nitrogen (N) contents were supplemented with urea to meet minimum dietary crude protein requirements. Key results DMD, OMD and DOMD ranged from 0.538 to 0.773, 0.550 to 0.810, 0.505 to 0.762 and 0.551 to 0.749, 0.584 to 0.786, 0.539 to 0.702 for cattle and sheep respectively. DMD, OMD and DOMD determined in sheep explained 88.7, 86.3 and 78.4% of the variation of DMD, OMD and DOMD in cattle respectively. In Experiment 1, DOMD was higher in cattle than sheep but for two silages (Silage 1, Subterranean clover: 0.631 vs 0.589; Silage 5, Annual ryegrass/oats, early cut: 0.761 vs 0.702) whereas in Experiment 2 DOMD was lower for cattle than sheep for one silage (silage 21, maize: 0.645 vs 0.691, s.e.d. = 0.019). Conclusions and Implications Since there was no clear trend for sheep to digest higher quality feeds better than cattle or for cattle to digest lower quality feeds better than sheep, we conclude that, at least for silages made from forage, sheep-derived values for digestibility should, in most instances, be applicable to cattle.
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Mahgoub, Osman, Isam T.Kadim, Hamza A. Babiker y Mohammed N. Al-Kindi. "The Influence of Diets Containing Phenols and Condensed Tannins on Protein Picture, Clinical Profile and Rumen Characteristics in Omani Sheep". Sultan Qaboos University Journal for Science [SQUJS] 19, n.º 2 (1 de febrero de 2015): 8. http://dx.doi.org/10.24200/squjs.vol19iss2pp8-16.
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A study was carried out to investigate the effects of feeding low quality non-conventional feeds (NCF) containing phenols and condensed tannins on health and performance characteristics in Omani sheep. Twelve Omani sheep were fed one of two base roughages, urea-treated palm frond (UTPF) or Rhodesgrass hay, (RGH) plus a commercial concentrate for 63 days. Haematological, serum biochemical and urine analyses were used to assess sheep health. Serum protein fractions were measured using electrophoresis. Urea-treated palm frond contained higher levels of polyphenols and condensed tannins and fiber than Rhodesgrass hay or concentrate feed. Animals fed UTPF had lower feed intake (P<0.05) and lower body gain (P<0.001) than those fed RGH. Rumen liquor of UTPF-fed animals had higher pH, ammonia-nitrogen and butyric fatty acid but lower acetic fatty acid (P<0.05). Animals fed UTPF had higher neutrophil (P<0.05) but lower lymphocyte (P<0.05) and monocyte (P<0.001) counts by the end of the trial than those fed RGH. There were no effects of diet on serum albumin or globulin fraction levels or albumin:globulin ratio. There were no major effects on urine analysis but there was a trend by control animals to have higher protein and specific gravity than treated ones. This study indicated that feeding low quality non-conventional feeds containing polyphenols or tannins would reduce body gain and may produce some effects on clinical parameters. Although tannins are known to influence protein digestion and absorption in ruminants, it did not significantly affect the serum protein picture in sheep.
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Melese, Gashu, Tamir Berhan y Urge Mengistu. "Effect of Supplementation with Non-Conventional Feeds on Feed Intake and Body Weight Change of Washera Sheep Fed Urea Treated Finger Millet Straw". Greener Journal of Agricultural Sciences 4, n.º 2 (15 de marzo de 2014): 067–74. http://dx.doi.org/10.15580/gjas.2014.2.1202131003.
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Pepeta, Bulelani Nangamso, Mehluli Moyo, Abubeker Hassen y Ignatius Verla Nsahlai. "Stocking Rate Has No Confounding Effect on the Use of Internal and Inert Markers to Predict Botanical Composition, Diet Quality, Degradability and Passage Rate Kinetics in Sheep". Animals 10, n.º 12 (27 de noviembre de 2020): 2232. http://dx.doi.org/10.3390/ani10122232.
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This study investigated if there is any confounding effect of stocking rate on the use of internal markers to determine and predict the dietary ingredient composition, dry matter intake (DMI) and digestibility of diets consumed by sheep. Fifteen sheep were randomly allocated to stocking rate treatments of one (SR1), two (SR2), four (SR4) and eight (SR8) sheep per pen (space allowance: 31.04 m2, 15.52 m2, 7.76 m2 and 3.88 m2 per sheep, respectively) and fed ad libitum maize stover, sorghum stover and veld hay by supplying 110% of previous day’s intake. Sheep were rotated across the treatments in four periods of 10 days. The proportion of feeds selected and total DMI were similar across all stocking rate treatments. However, diets selected by sheep in SR2 had the highest digestibility compared to other treatments. The prediction of the effective degradability of dry matter using acid detergent fibre content achieved an accuracy of 84.6%. A combination of crude protein and neutral detergent fibre contents achieved 63% accuracy in the prediction of the rate of degradation of feeds. The use of acid insoluble ash (AIA) as an internal marker to predict nutrient intake, digestibility, DMI and dietary ingredient intake accounted for 84.3%, 81.2%, 53.0% and 64.1% of the variation, respectively. The predictions of dietary feed proportions and nutrient quality selected obtained with least squares procedure using a combination of modified acid detergent fibre (MADF), acid detergent lignin (ADL) and AIA accounted for 81.0% and 72.4% of the variation, respectively. In conclusion, regardless of the different stocking rate tested in this study, a combination of MADF, ADL and AIA as internal markers can be used to estimate diet and nutrient selection by sheep using the least squares procedure. Hence, these markers can be used to predict ingredient composition of diet, diet and nutrient selection, nutrient intake and digestibility in free ranging animals.
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AKINLADE, J., J. A. OLANITE y M. A. BAMIKOLE. "DRY MATTER DEGRADATION CHA RACTERISTICS OF RICE STOVER WITH DIFFERENT PROPORTIONS OF Ficus capensis OR Alchornea cordifolia IN RUMEN FISTULATED SHEEP, GOATS OR CATTLE". Nigerian Journal of Animal Production 28, n.º 2 (4 de enero de 2021): 174–81. http://dx.doi.org/10.51791/njap.v28i2.1902.
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Rumen dry matter degradation characteristics (soluble fraction, degradable fraction, rate of degradation and effective degradability) of leaves of two browse species (Alchornea cordifolia, Ficus capensis) and rice stover and their varying proportions (10, 20 or 30% of each browse: crop residue mixture) were evaluated in rumen fistulated West African Dwarf sheep and goats and Bunaji cattle. The forages differed (P<0.05) in soluble fraction (a) rate of degradation (c) and effective degradability (ED) but did not differ in the degradable fraction (b). Rice stover bad the highest rate of degradation and F. capensis the least. Effective degradability (ED) was highest in cattle followed by sheep and goats with a high degree of correlation among them. The inclusion of the different proportions of browse in the mixtures show some significance in a, b and ED (P<0.05). Mixture had a depressive effect on the soluble fraction of the feeds in rice stover: A. cordifolia mixtures. Degradable fraction differed mainly in F. capensis mixtures. The rate of degradation was affected mainly in sheep and cattle among the feeds in rice stover: F. capensis mixtures. The different mixtures influenced effective degradability. As with the sole feeds, ED was highest in cattle, followed by sheep and goats.
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Jarzynowska, Anna y Ewa Peter. "The effect of adding herbs to the winter diet on the fatty acid profile of the lipid fraction of sheep milk". Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego 13, n.º 4 (28 de diciembre de 2017): 43–54. http://dx.doi.org/10.5604/01.3001.0013.5201.
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The study was carried out on bulk milk samples collected at two-week intervals during the winter (February-April) and individually from ewes at the end of the experiment. The milk was obtained from ewes of the coloured variety of Polish Merino, housed indoors and fed conserved bulky feeds and a mixture of concentrate feeds. Three diet groups were established: group I – control (without the addition of herbs to the concentrate feed) and groups II and III, in which an herbal mixture was added to the concentrate feed in the amount of 10 and 20 g/sheep/day, respectively. The effect of the herb supplement in the sheep diet on the fatty acid profile of the milk fat was analysed. The results showed that in the period from 69 to 137 days of lactation the content of SFA increased in the milk fat of sheep fed without the addition of herbs, while the content of UFA decreased. The addition of the herbal supplement to the concentrate feed in the amount of 10 or 20 g/sheep/day improved the fatty acid profile from the 97th day of lactation. As a result, at the end of the experiment, the milk fat of sheep in groups II and III contained more MUFA acids than that of group I (6.7%; P≤0.05 and 10.6%; P≤0.01, respectively), more PUFA (by 11.1% and 12.5%; P≤0.01), and more DFA (by 6.3%; P≤0.05 and 11.8%; P≤0.01). The addition of herbs in the amount of 10 or 20 g/sheep/day (groups II and III) increased the content of n-3 PUFAs in the milk fat (by 17.5%; P≤0.01 and 7.9%; P≤ 0.05, respectively,), n-6 PUFA (by 9.7% and 11.4%; P≤0.01) and CLA (by 11.9% and 28.6%; P≤0.01), and decreased the content SFA (by 1.75% and 2.8%, respectively; P≤0.01) and OFA (by 2.9%; P≤0.05 and 5.2%; P≤0.01). In both experimental groups, beneficial changes were also noted in the health quality indicators of the milk, calculated on the basis of the UFA/SFA, DFA/OFA and PUFA/SFA ratios.
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Chapple, D. G., K. P. A. Wheeler, G. Perrott y M. Witt. "Comparison of sugar beet feeds and distillers grains as supplements for early lambing ewes fed straw-based and big-bale silage diets". Proceedings of the British Society of Animal Science 1999 (1999): 126. http://dx.doi.org/10.1017/s1752756200002817.
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Feeding lowland sheep on straw-based systems during pregnancy (Davies and Chapple 1995) has shown that ewe and lamb performance can be satisfactory, providing adequate compound supplementation was fed. Whole barley and soya bean meal has been the standard ration. Experiments with March-lambing ewes (Chapple et al., 1997) has shown that feeds based on molassed sugar beet feed and maize distillers dark grains can replace a barley/soya supplement. The objective of this work was to evaluate the effects on ewe and lamb performance of feeding sugar beet feeds with higher levels of distillers grains to January-lambing ewes on straw-based and big-bale silage systems during pregnancy and early lactation.
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Jarzynowska, Anna y Ewa Peter. "The influence of the addition of herbs to the winter diet of sheep on the yield of bundz rennet cheese and its nutritional value". Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego 14, n.º 1 (29 de marzo de 2018): 39–51. http://dx.doi.org/10.5604/01.3001.0013.5196.
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The study was carried out on samples of raw sheep milk and bundz rennet cheese produced from it. The milk was obtained from ewes of the coloured variety of Polish Merino, from February to April, housed indoors and fed with preserved bulky feed and a mixture of concentrate feeds. Three groups were formed for the experiment: group I – control, fed without the addition of herbs to the concentrate feed, and groups II and III, in which an herb mixture was added to the concentrate feed in the amount of 10 and 20 g/sheep/day, respectively. Six experimental batches of bundz rennet cheese were made from the sheep milk, and the effect of the addition of herbs to the sheep diet on the chemical composition of the raw milk used to make cheese, the cheese yield and its nutritional value was analysed. The results showed that the use of herbal supplements in the feed of the coloured variety of Polish Merino sheep in winter had no effect on the chemical composition of the raw milk, and thus its value for processing, expressed as the yield of bundz rennet cheese. The addition of herbs in the amount of 20 g/sheep/day to the diet of sheep significantly increased the content of minerals in cheese made from the milk obtained from the group III sheep, by 6.1% and 6.6% as compared to groups I and II, respectively (P≤0.05). The experimental factor had no influence on the other parameters of the nutritional value of the cheese, i.e. on the content of protein and fat or their mutual proportions, or on its energy value.
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Paya, H., A. Taghizadeh, H. Janmohamadi y G. A. Moghadam. "The relationship between in vitro and in situ dry matter disappearance of some Iranian feedstuffs in sheep". Proceedings of the British Society of Animal Science 2007 (abril de 2007): 210. http://dx.doi.org/10.1017/s175275620002113x.
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Ration formulation systems require information on nutrient requirements of the animal and reliable values for rumen degradable and undegradable fractions of feed ingredients. The in situ nylon-bag technique is widely used to characterize the disappearance of feeds from the rumen (Woods et al., 2002). The objective of this study was determining of relationship between in vitro and in situ dry matter disappearance.
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Abreha, Hagos H., Getachew Animut, Aklilu Hailemichael, Dawit G. Tedla y Fsahatsion H. Baragabr. "Effect of Commercial and Non-conventional Feeds, Leaves of Indigenous and Improved Multipurpose Tree Supplementation on Feed Intake, Digestibility and Growth Performance of Sheep". Open Agriculture Journal 13, n.º 1 (31 de diciembre de 2019): 207–14. http://dx.doi.org/10.2174/1874331501913010207.
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Background: Acute shortage of feed and very poor quality of the available feeds during the dry season are the prime limiting factors for increasing the production and productivity of small ruminants in most agroecological zones of Ethiopia. Thus, the study evaluated the effect of concentrate mixture of wheat bran and Sesame seed cake (T1), Atella (T2), Faidherbia albida (T3) and Sesbania sesban leaves (T4) on feed intake, digestibility, body weight change and economical profitability of local sheep. Methods: Twenty-four yearling intact local male sheep with mean Initial Body Weight (IBW) of 18 ±1.55 kg (mean ± SD) were used for the experiment. The study was conducted using randomized complete block design and sheep were blocked into six based on their IBW. Sheep within a block were randomly assigned to treatments. The experiment had 90 days feeding trial and 7 days digestibility trial after 15 and 3 days acclimatization period, respectively. The amount of supplements offered was 300 (T1), 330 (T2), 360 (T3) and 280 (T4) g/day on DM basis, each calculated to supply 73.6 g/day Crude Protein (CP). Results: Hay intake in T1, T2 and T4 (397˗400 ±1.44g/day) were significantly (P < 0.001) higher than T3 (375±1.44 g/day). Total DM intake was in the order of T2 = T3>T1> T4 (p<0.001) (698, 730, 735 and 677 g/day for T1, T2, T3 and T4, respectively. Digestibility of CP was in the order of T1 > T2>T4 > T3 (p<0.001), while the value in T2 differed only with T3 (75.6, 73.4, 60.2 and 67.9 for T1, T2, T3 and T4, respectively). Average Daily Gain (ADG) was 50, 45, 38 and 42 g/day for T1, T2, T3 and T4, respectively and differed only between T1 and T3. The partial budget analysis indicated that, sheep supplemented with Atella returned higher net income (5.46 US$) than T1 (1.93 US$), T3 (2.56 US$) and T4 (3.2 US$); similarly, MRR was also higher in T2 (93.7%) compared to T3 (56.1%) and T4 (50.4%). Conclusion: Sheep producers can use the supplement feeds in the order of T2, T4 and T3, respectively, based on their availability.
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AL-Shami, Salah, I. Ap Dewi y H. Omed. "Effects of supplementary feed and competition with Cambridge ewes on the browsing behaviour of Welsh Mountain sheep". Proceedings of the British Society of Animal Science 1998 (1998): 100. http://dx.doi.org/10.1017/s0308229600033134.
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Trees and shrubs play an important role in increasing feed supplies to animal production in many tropical systems. These feeds sources can be browsed directly by animals or can be cut and carried (Ivory, 1989). Understanding the behaviour of domestic animals is an important tool in improving their management and production (Malechek and Provenza, 1983). An experiment was conducted to examine the effect of between-breed competition on the browsing behaviour of Welsh Mountain sheep, with alternative sources of supplementary feed using Cambridge ewes as the competing breed.
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Cropper, M. R., D. P. Poppi y A. M. Nicol. "Growth of lambs given different allowances of digestible crude protein and metabolisable energy". Proceedings of the British Society of Animal Production (1972) 1992 (marzo de 1992): 174. http://dx.doi.org/10.1017/s0308229600022844.
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In a market where high levels of fat on lamb carcases are not favoured, the supposition that a lamb, given adequate feeding, will grow protein preferentially to gaining lipid, holds interest. However, this idea runs counter to the evidence that body composition is not manipulable in sheep. Therefore, an experiment was undertaken to implement extreme treatments of protein and energy supply to determine to what extent the contrasting views on body composition changes in growing lambs are justified.Seventy-two Coopworth ram lambs (mean liveweight, (LW) 30.4, s.d. 1.1 kg) were given one of the three feeds of different digestible crude protein (DCP) content at one of three allowances (ad libitum (AL), 1.2 (H) or 0.8 (L) kg/day). The feeds (H, M and L) were formulated as shown in Table 1. Feed M was a mixture of 0.55 Feed H and 0.45 Feed M. The proximate composition, measured DCP and estimated metabolisable energy (ME) content of the feeds is given in Table 1. ALH and ALM lambs were also choice-fed with ad libitum access to feed L. 8 lambs at the start of the experiment and 4 lambs per treatment at 6 and 12 weeks were slaughtered for analysis of body protein (PR), lipid (LP) and wool protein (WP).
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Kyriazakis, I. y J. D. Oldham. "The ability of growing sheep to select a diet that meets their protein requirements". Proceedings of the British Society of Animal Production (1972) 1992 (marzo de 1992): 23. http://dx.doi.org/10.1017/s0308229600021474.
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Whilst our previous work (Hou et al, 1991) has shown that sheep will make structured selections amongst pairs of feeds offered as a choice, we have not been able to relate these selections to the animals requirements as estimated by relative performance as single feeds. Also the nature of crude protein in diets offered as a choice has not been used as a variable.The objective of the experiment was to develop the proposition that growing sheep, when given a choice between a suitable pair of foods, will select a diet that meets their protein requirements by using pairs of foods to be given as a choice and also offering each food singly to sheep, in order to quantify the effects of the foods on performance. In order to address an aspect of the extent to which sheep may make selections between diets to satisfy digestive (rumen) function rather than metabolic needs we have also included urea supplementation of an otherwise low CP diet amongst the foods offered as a choice.
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Ilian, M. A., M. A. Razzaque y A. J. Salman. "Unconventional feeds for sheep: Some aspects of rumen and blood biochemistry". Biological Wastes 24, n.º 3 (enero de 1988): 187–97. http://dx.doi.org/10.1016/0269-7483(88)90061-4.
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Thomas, Dean T., Allan J. Rintoul y David G. Masters. "Increasing dietary sodium chloride increases wool growth but decreases in vivo organic matter digestibility in sheep across a range of diets". Australian Journal of Agricultural Research 58, n.º 11 (2007): 1023. http://dx.doi.org/10.1071/ar07032.
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For 8 weeks, 64 Merino wethers, 18 months of age, were individually penned and offered 1 of 16 treatment feeds (n = 4). The 16 feeds were formulated to contain levels of added sodium chloride (0, 7, 14, 21%) and levels of organic matter digestibility (55, 62, 69, 76%), in a 4 × 4 factorial design. The treatment feeds were offered ad libitum for 7 weeks and at maintenance for the final week. Clean wool growth, corrected for digestible organic matter intake, increased by 16, 18 and 27% as added sodium chloride was increased (7, 14, and 21%). The increase in wool growth was similar for diets at all levels of formulated organic matter digestibility. Feed digestibility in sheep decreased when added dietary sodium chloride was 14% or higher. The decrease in organic matter digestibility was ~5 percentage units at the highest level (21%) of dietary sodium chloride. Liveweight gain in sheep was reduced from 143 to 134, 65 and 1 g/day with 7, 14 and 21% added dietary sodium chloride, respectively. Therefore, improvement in wool growth efficiency appears to occur at the expense of liveweight gain, and was probably related to a shift in digestion of feed from the stomach to the small intestine. Higher corrected clean wool growth associated with lower levels of purine derivatives (an indicator of microbial protein synthesis) supported the conclusion that increased dietary salt resulted in an increase in dietary protein being digested in the small intestine. A shift in feed utilisation towards increased wool growth as dietary salt increases may be a management tool of particular interest to specialist wool producers. In areas of saline land where salt-accumulating shrubs are often the most productive vegetation, an increase in wool production efficiency, even if liveweight is only maintained, may improve the profitability of incorporating these shrubs into a feeding strategy.
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Ahmed, S., MRH Rakib y MA Hemayet. "Effect of Total Mixed Ration Based Complete Pellet Feed on the Performances of Stall Fed Native Sheep". SAARC Journal of Agriculture 18, n.º 2 (4 de enero de 2021): 157–66. http://dx.doi.org/10.3329/sja.v18i2.51116.
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A complete pellet feed was developed using 40 % roughage (Rice straw) and 60 % concentrate (Rice polish 50 %, Maize crush 16 %, Soybean meal 20 %, Molasses 10 %, Salt 2 %, DCP 1 %, Vitaminmineral premix 0.5 %, Pellet binder 0.5 %) for commercial sheep production under stall feeding system. To know the effect of complete pellet feed on animal performances, both on-station and on-farm trials were conducted in growing sheep. The results of the experiment demonstrated that in the traditional system of rearing; only 22.42 g daily weight gain was observed. While, feeding of complete pellet feed achieved 84.98 g, and 100.67 g daily weight gain at on-farm and on-station condition respectively suggesting that pelleting enhanced the efficiency of utilization of feed. However, no differences were observed for the feed cost per kg weight gain, feed conversion ratio (FCR) and benefit-cost ratio (BCR) among the pellet feeding group and other group. But results suggest that complete pellet feed would be more economical for commercial sheep production under the stall-fed condition and farmers would be more benefited using complete pellet feed compared to conventional grass or urea molasses straw (UMS) and concentrate based feeding system. No disease or clinical symptoms were observed in the animals during the experimental period, suggesting that pellet feeds are well accepted by the sheep and results in better growth rate.
SAARC J. Agri., 18(2): 157-166 (2020)
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ARMOUR, JENNIFER y BURTON W. BLAIS. "Cloth-Based Hybridization Array System for the Detection and Identification of Ruminant Species in Animal Feed". Journal of Food Protection 69, n.º 2 (1 de febrero de 2006): 453–58. http://dx.doi.org/10.4315/0362-028x-69.2.453.
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A cloth-based hybridization array system for the detection and identification of material derived from several ruminant species (cattle, sheep, goat, elk, and deer) in animal feeds has been developed. Primers targeting conserved mitochondrial DNA sequences amplified ruminant DNA in a universal PCR, and the digoxigenin-labeled amplicons were hybridized with an array of species-specific oligonucleotide capture probes on a polyester cloth support. The hybridized amplicons were detected on the cloth by sequential reactions with antidigoxigenin antibody–peroxidase conjugate and chromogenic substrate solution. This cloth-based hybridization array system provided sensitive and specific detection and identification of meat meal containing rendered cattle, sheep, goat, elk, and deer material blended in feeds.
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Woods, V. B., A. P. Moloney, F. P. O'Mara, F. Mulligan y M. J. Kenny. "The effect of animal species and level of consumption by cattle on in vivo digestibility of concentrate ingredients". Proceedings of the British Society of Animal Science 1998 (1998): 77. http://dx.doi.org/10.1017/s0308229600032906.
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It has been suggested that cattle have a greater ability to digest fibrous feeds and a lower ability to digest non-fibrous feeds than sheep (Mc Donald et al., 1995). This statement applies mainly to forages and few direct comparisons have been conducted using concentrate ingredients. The digestibility of concentrate ingredients may be influenced by the level of consumption since an increase in intake of a complete diet resulted in a decrease in digestibility (El Khidir and Vestergaard Thomsen, 1983). The aims of this study were (a) to determine the effect of level of consumption by cattle and (b) to examine the effect of animal species (sheep and cattle) on the digestibility of concentrate ingredients.
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MURPHY, JOHANNA, JENNIFER ARMOUR y BURTON W. BLAIS. "Cloth-Based Hybridization Array System for Expanded Identification of the Animal Species Origin of Derived Materials in Feeds". Journal of Food Protection 70, n.º 12 (1 de diciembre de 2007): 2900–2905. http://dx.doi.org/10.4315/0362-028x-70.12.2900.
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A cloth-based hybridization array system (CHAS) previously developed for the detection of animal species for which prohibited materials have been specified (cattle, sheep, goat, elk, and deer) has been expanded to include the detection of animal species for which there are no prohibitions (pig and horse) in Canadian and American animal feeds. Animal species were identified by amplification of mitochondrial DNA sequences by PCR and subsequent hybridization of the amplicons with an array of species-specific oligonucleotide capture probes immobilized on a polyester cloth support, followed by an immunoenzymatic assay of the bound PCR products. The CHAS permitted sensitive and specific detection of meat meals from different animal species blended in a grain-based feed and should provide a useful adjunct to microscopic examination for the identification of prohibited materials in animal feeds.
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Jones, R. J., J. H. F. Meyer, F. M. Bechaz, M. A. Stoltz, B. Palmer y G. van der Merwe. "Comparison of rumen fluid from South African game species and from sheep to digest tanniniferous browse". Australian Journal of Agricultural Research 52, n.º 4 (2001): 453. http://dx.doi.org/10.1071/ar00107.
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The hypothesis that South African game animals that use browse containing condensed tannins (CT) could have rumen microbial populations better able to ferment tanniniferous forages was explored. Rumen fluid (RF) from a range of browsing ruminants was used to ferment tanniniferous forages in vitro and the results were compared with the values obtained with rumen fluid from sheep. Leaves of the shrub legumes Leucaena leucocephala, L. pallida, L. trichandra, Calliandra calothyrsus,Gliricidia sepium, and Acacia boliviana were used as substrates. In vitro digestibility of dry matter (IVDMD) and nitrogen (IVND) was measured in the presence or absence of polyethylene glycol (PEG) 4000 to assess the adverse effects of the CT in the feeds. Rumen fluid from giraffe, greater kudu, eland, duiker, impala, nyala, goat, and gnu was compared with that from sheep. Ability to metabolise or block the adverse effects of CT was expected to result in only a small or no response to PEG in terms of IVDMD and IVND with rumen fluid from browsers, and therefore to result in a significant animal feed and animal PEG interaction. There were no significant (P > 0.05) animal feed interactions. For every animal species there was a response to PEG in terms of IVND, and this response was linearly related to the CT in the feed as measured by PEG binding using 14C-labelled PEG. Rumen fluid from browsers had a lower pH (5.78 0.060 v. 6.68 0.052) and a higher dry matter content (1473 102 mg v. 415 4.3 mg/100 mL RF) than that of grazers (sheep and gnu). However, when measured at 2 pH levels (6.7 and 5.8), IVDMD and IVND of the feeds were not improved at the lower pH with rumen fluid from the browsers. Rather, digestibility was depressed at the lower pH with rumen fluid from all animal species. We conclude from these in vitro studies that rumen microbial populations from browsers are not able to ferment tanniniferous forages better than rumen microbial populations from grazers. It seems likely that these browsers do not have rumen bacteria capable of degrading the CT in these shrub legumes. Production on such tanniniferous feeds may well depend on tannin binding with proline-rich saliva rather than on metabolism of or tolerance to CT by rumen bacteria.
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Hurst, D., D. L. Romney y A. H. Murray. "Evaluation of the potential of short term intake rate (STIR) to predict effects of chop length on in vivo parameters in sheep". Proceedings of the British Society of Animal Science 1999 (1999): 105. http://dx.doi.org/10.1017/s175275620000260x.
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Parameters from in vitro gas production and in situ degradability are often used to predict digestibility and intake in vivo. However, these methods use dried ground feed samples and cannot be expected to estimate the effect of changes in physical form or particle size. Previous work (Romney and Gill 1998) has indicated that short term intake rate (STIR) values showed potential to rank a variety of feeds in terms of their ad libitum dry matter intake, rate of passage and digestibility. Since STIR values are determined on feeds “as offered” it is likely they will reflect the effects of physical structure on in vivo parameters. The present work examines whether measurement of STIR values can be used to predict in vivo responses to changes in particle size distribution in chopped forages.
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Sein, T. y J. R. Todd. "Investigations into the use of indicator methods of estimating the digestibilities of feeds by ruminant animals". Journal of Agricultural Science 110, n.º 2 (abril de 1988): 315–20. http://dx.doi.org/10.1017/s002185960008134x.
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SummaryThis paper describes a comparison of acid insoluble ash (AIA) and acid detergent lignin (ADL) ratio techniques for estimating digestibility with the conventional total collection method using sheep fed a range of feeds. In only two of 17 digestibility trials were the results obtained by AIA ratio techniques significantly different from those obtained by the total collection method. In the case of ADL no significant differences occurred between the results obtained by the ratio technique and total collection method.In a trial using sheep in metabolism cages the AIA and ADL contents of faeces excreted in consecutive 4 h periods covering 48 h did not show any significant variation either within or between the two 24 h periods.The results obtained from ‘grab’ samples of faeces (25–40 g) taken per rectum or from faeces bags attached to sheep fed communally can be expected to give acceptable agreement with total collection provided the marker concentration in the faeces represents a number of sheep sampled on several days, since variation between individual samples of faeces may be high.
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Pent, Gabe J. "192 Towards Year-Round Grazing in the Southeastern U.S". Journal of Animal Science 98, Supplement_2 (1 de noviembre de 2020): 67. http://dx.doi.org/10.1093/jas/skz397.153.
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Abstract Winter feeds costs for small ruminants exceeds 50% of the total cost of most small ruminant production systems in the Southeastern U.S. Keeping these feed costs low is one of the most effective and time-tested ways to improve farm profitability. While maintaining an appropriate stocking rate will be critical for sustaining long-term farm productivity, a suite of other management practices is available to assist in this objective. Installing appropriate fence and watering system infrastructure for managing grazing will be critical for improving harvest efficiency and stockpiling forages for utilization when forage growth is limited. Filling gaps in forage production may also be achieved through the strategic use of a number of forage species, including warm-season or cool-season forages and annual or perennial forages. Managing stored forages appropriately during storing and feeding will help minimize feed losses, while producing quality hay will reduce the need for supplementary feeds. With the adoption of these proven practices, sheep and goat production may be optimized by allowing them to harvest their own feed almost year-round in the Southeastern U.S.
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Chapple, D. G., K. P. A. Wheeler, G. Perrott y M. Witt. "Simple mixes of molassed sugar beet feed and distillers grains for lactating ewes". Proceedings of the British Society of Animal Science 2000 (2000): 78. http://dx.doi.org/10.1017/s175275620000079x.
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Feeding of lowland sheep on straw-based systems during pregnancy and in early lactation has shown that ewe and lamb performance can be satisfactory, providing adequate compound supplementation is fed (Davies and Chapple, 1995). Whole barley and soya bean meal has been the standard ration. However, soya bean meal is imported and not fully traceable. Experiments with January- and March-lambing ewes have shown that traceable, homeproduced feeds based on equal quantities of molassed sugar beet feed and either maize or barley distillers grains can replace a barley/soya supplement when fed with straw or silage-based diets in late pregnancy (Chappleet al., 1998 and 1999). The objective of this work was to evaluate the effects on ewe and lamb performance of feeding sugar beet feeds with distillers grains to March-lambing ewes rearing twin lambs at pasture.
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Whitelaw, FG, JS Milne, ER Orskov, R. Stansfield y MF Franklin. "Urea metabolism in sheep given conventional feeds or nourished by intragastric infusion". Experimental Physiology 75, n.º 2 (1 de marzo de 1990): 239–54. http://dx.doi.org/10.1113/expphysiol.1990.sp003398.
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Ilian, M. A., M. A. Razzaque y A. J. Salman. "Unconventional feeds for sheep: Effects on performance and meat quality and composition". Biological Wastes 24, n.º 2 (enero de 1988): 115–25. http://dx.doi.org/10.1016/0269-7483(88)90054-7.
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Sarker, AK, MR Amin, MA Hossain, MS Ali y MA Hashem. "Present Status of Organic Sheep Production in Ramgoti Upazila of Lakshmipur District". Journal of Environmental Science and Natural Resources 10, n.º 2 (29 de noviembre de 2018): 95–103. http://dx.doi.org/10.3329/jesnr.v10i2.39018.
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The experiment was conducted to investigate the present status and potentialities of organic sheep production in Lakshmipur district of Bangladesh. Data were collected through an interview schedule personally from 30 respondents in 3 villages of Ramgoti Upazila who were involved in sheep production. Parameter studied were origin, feeds and fodder, breeding, health care, living condition of livestock and factors related to organic sheep production. All sheep was indigenous. 60 per cent farmers used roadside grass and 40% cultivated and roadside grass. Most of the farmers used mixed feed which was bought from local market and 17% farmers used vitamin mineral supplementation. All farmers used natural breeding. About 80, 80 and 83% farmers practiced vaccination, de-worming and grooming, respectively. About 13% farmers used hormone, antibiotic and growth promoter and only 33% farmers remove sick or injured animal from healthy stock. All farmers allowed access to outdoor and pasturing during winter season and none reared male and female sheep separately. Farmers did not keep and kept their livestock record were 90 and 10%, respectively. Most of the farmers were middle aged categories (53%) and education level of farmers of primary, secondary and higher secondary were 63, 30 and 7%, respectively.J. Environ. Sci. & Natural Resources, 10(2): 95-103 2017
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Debele, Selamawit y Matiwos Habta. "Sheep and goat production practice in agroforestry systems of Gedio Zone, Ethiopia". International Journal of Environment 4, n.º 2 (3 de junio de 2015): 296–307. http://dx.doi.org/10.3126/ije.v4i2.12658.
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The study was conducted to describe sheep and goat production practice in three Agro-ecological Woredas of Gedio zone, southern Ethiopia. A set of semi-structured questionnaire was used to collect information from 120 sheep and goat owners based on single-visit-interviews. 32.6% of them participate in crop production, 56.5% of them involved in both animal and crop production and 5% of them involved in crop production, animal production and off farm activity. Sheep flock in the study sites were significantly different; and were 5.63, 6.97 and 3.4 in Wenago, Dilla and Kochera sites, respectively. Major feed resources were grazing (33.5%). The highest mortality rate occurred in suckling flock (16.24% lambs; 16.3% kids), young flock (9.64% lambs; 13.24% kids) and breeding females (ewes 12.06% and does 14.1%) in all study sites. Sheep and goat production in the studied areas was constrained by different problems; where the major ones are availability and cost of feeds, limitation of land for the expansion of production and poor extension services. Sheep and goats are very important smallholder producers due to their biological factors such as short generation interval, twinning, have short growth periods and do not require much space. DOI: http://dx.doi.org/10.3126/ije.v4i2.12658 International Journal of Environment Vol.4(2) 2015: 296-307
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Warmington, B. G., G. F. Wilson y T. N. Barry. "Voluntary intake and digestion of ryegrass straw by llama × guanaco crossbreds and sheep". Journal of Agricultural Science 113, n.º 1 (agosto de 1989): 87–91. http://dx.doi.org/10.1017/s0021859600084653.
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SUMMARYThe voluntary feed and water intakes of five llama × guanaco crossbreds (New World camelids) and five sheep, and their abilities to digest various feed components and to utilize nitrogen, were compared using a diet of threshed ryegrass straw in New Zealand in 1987.The camelids ate more than the sheep, but intakes were similar relative to metabolic live weight (mean 37·6 g dry matter/kg W0·75 per day). They drank 0·62 times as much water as sheep per kg W0·75, and 0·57 times as much per g DM intake (P < 0·05). Mean apparent digestibilities of dry matter (47.7%), energy (41·6%) and cell-wall fractions (48·4%) were similar in both species, in spite of the sheep selecting a higher-N component of the diet. Variation in digestibility (e.g. organic matter digestibility) among individual sheep was inversely associated with the percentage of cell-wall constituents consumed. The faeces of camelids contained a significantly higher proportion of particles longer than 0·5mm than those of the sheep (17 v. 11% total DM), indicating a slightly larger threshold to passage from the forestomachs in the camelids.All animals were in negative N balance during the trial, but net loss of N was less in the camelids than in the sheep (27·6 and 49·5 g N/100 g N intake, respectively; P < 0·05), because of lower urinary N excretion (36·5 and 60·3 g N/100 g N intake, respectively; P < 0·05) of the camelids. The results suggest that camelids may be better suited than ruminants for production from poor-quality feeds, especially if water supply is limited.
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Vipond, J. E., G. Horgan y D. Anderson. "Estimation of food intake in sheep by blood assay for lithium content following ingestion of lithium labelled food". Proceedings of the British Society of Animal Science 1995 (marzo de 1995): 16. http://dx.doi.org/10.1017/s0308229600027860.
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Current rationing systems for sheep and cattle aim to balance a deficit in a basal roughage diet by giving group-fed animals a fixed amount of supplementary food. Assumptions are made that both the intake of basal diet and supplementary feed are average values. Coefficients of variation in individual intake of supplementary feeds of 16-36% have however been observed (Foot and Russel, 1973; Foot et al, 1973) and this variation may be larger (67-107%) where supplements are available as feed blocks (Kendall et al, 1983; Ducker et al, 1981).Recent work on the selection of feed ingredients by sheep (Kyriazakis and Oldham, 1993) and the effect of physiological factors such as parasitism on diet selection (Kyriazakis et al, 1994) suggest that there may be biological mechanisms behind this variation. Estimation of intake of supplements has been difficult in the past, particularly at pasture using chronic oxide and N-alkane indigestible marker systems owing to the need for complete faecal collection procedures and handling procedures that disrupt grazing. A promising new method using lithium as a marker has been developed in Australia (Nolan et al, 1994). This work was undertaken to evaluate the lithium technique for use under UK conditions to elucidate causes of variation in supplement intake of sheep.
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NSAHLAI, I. V., N. N. UMUNNA y P. O. OSUJI. "Complementarity of bird-resistant and non-bird-resistant varieties of sorghum stover with cottonseed cake and noug (Guizotia abyssinica) cake when fed to sheep". Journal of Agricultural Science 130, n.º 2 (marzo de 1998): 229–39. http://dx.doi.org/10.1017/s0021859697005182.
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A study was conducted to examine whether oilseed cakes (cottonseed cake (CSC) or noug (Guizotia abyssinica) cake (NSC)) are complementary to the bird-resistant (BR) and non-bird-resistant (NBR) varieties of sorghum stover and whether sheep select against morphological fractions containing high concentrations of tannins or proanthocyanidins (PA). Either 24 (growth study) or 16 (metabolism study) Ethiopian Menz sheep were used in a randomized complete block design to study the interaction of variety of sorghum stover with type of oilseed cake on feed selection, intake, digestibility, microbial protein synthesis, nitrogen (N) retention and growth. The degradability of the feeds and refusals was also determined. The NBR variety was more degradable than the BR variety during the early hours of incubation. NSC degraded faster, although to a lesser extent than CSC. Stover variety had no effect on ruminal ammonia concentration (RAC) while CSC induced a higher RAC than NSC did. Sheep given the NBR variety had more dust, less heads, less leaf, less sheath and more stem in their ingesta than those fed on the BR variety. It was seen that the sheep discriminated against the stems, since the ratio of stem in ingesta to stem on offer was <1. Since PA are more highly concentrated in the sheath than in any of the other plant fractions, it appears that the choice of the morphological composition of the ingesta by sheep was not determined by PA. Sheep selected a diet which was 2–5% or 5–11% more degradable than the offered or refused feeds, respectively. Relative to NSC, CSC enhanced the intake of N, N bound to neutral detergent fibre (NDF), digestibility and N retention and tended to increase (P<0·06) liveweight gain (LWG) and organic matter (OM) intake but had no effect on microbial protein synthesis. Compared with the NBR variety, the BR variety depressed N digestibility and N retention, had no effect on microbial protein synthesis and on LWG, but depressed the efficiency of LWG by c. 30%. Sheep given the BR+NSC diet had the lowest daily gain but excreted copious amounts of urine, probably in an attempt to eliminate toxic waste substances. Since sorghum is a crop of the semi-arid regions, it is quite likely that, although the bird resistance trait increases crop yield, it has resulted in a feed that is rather less suitable for livestock in this production environment, where water shortages are frequent. In-depth studies on the consequences of water shortage on the utilization of bird-resistant sorghum stover are required.
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Hogan, JP, PM Kennedy, CS McSweeney y AC Schlink. "Quantitative studies of the digestion of tropical and temperate forages by sheep". Australian Journal of Experimental Agriculture 29, n.º 3 (1989): 333. http://dx.doi.org/10.1071/ea9890333.
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Studies of the digestion by sheep of tropical grasses Digitaria decumbens and Setaria sphacelata and the temperate grass Lolium perenne grown at 27.5�S. latitude plus a clover Trifolium resupinatum grown in southern Australia are reported. There were no major differences between forages in the site of organic matter digestion, in protein flow from the stomach, in concentrations or proportions of rumen volatile fatty acids and in chewing behaviour between these data and the values generally reported for temperate forages of similar chemical composition and digestibility. However rumen ammonia concentrations for D. decumbens and S. sphacelata (53 and 34 mg N/L) were appreciably lower than predicted values of 108 and 131 mg N/L. Apart from this variable it appears that relationships developed with temperate feeds provide adequate prediction of digestive characteristics of tropical feeds.
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Ruzic-Muslic, D., M. P. Petrovic y Z. Bijelic. "Undegradable protein: Important factor in balancing of diets for fattening lambs". Biotehnologija u stocarstvu 27, n.º 3 (2011): 473–84. http://dx.doi.org/10.2298/bah1103473r.
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Although sheep breeding in our country mainly had extensive character, there is still room for implementation of the new concept of expression of nutritional value of proteins, primarily in fattening of lambs. For the purpose of maximum use of the genetic potential of high-yielding meat/fattening sheep breeds, share of undegradable protein in diet must be taken into consideration, since high protein requirements of such animals cannot be satisfied by microbial protein synthesis from usual protein and energy sources. Therefore, in contemporary, science based systems for assessment of protein value of feeds, degradability of proteins from food in rumen plays major role. In absence of data in domestic literature related to undegradability of proteins in certain feeds, results obtained in this study should be perceived as direction for future norming of diets in fattening of lambs in the intensive rearing system.
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Epifanova, I. y V. Epimakhov. "Intake mercury lead and arsenic with feeds and their accumulation (bioconcentration) in cattle and sheep organism". Bulletin of Science and Practice 5, n.º 3 (15 de marzo de 2019): 173–86. http://dx.doi.org/10.33619/2414-2948/40/23.
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When managing livestock in technologically polluted areas to assess and prevent the negative impact of feed on farm animals, to obtain products that meet sanitary and hygienic safety requirements, it is important to monitor constantly the levels of pollution by main ecotoxicants in all parts of the trophic chain soil — feed — animal body — livestock production. If acceptance contamination levels are higher than it is required, it is necessary to take measures for contaminants decreasing in final livestock products. A review of the study of intake mercury, lead and arsenic with feeds in cattle and sheep organisms under the condition of technogenic–affected agricultural areas is presented in this paper. Estimation of the contamination levels of individual links of the food trophic chain by these ecotoxicants is given. The article describes the experience of using enterosorbents in the diet as one of the most important ways to reduce the content of heavy metals in the body of farm animals and in the final products of animal husbandry.
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Jarzynowska, Anna y Ewa Peter. "The influence of the addition of herbs to the summer diet of sheep on the yield of bundz rennet cheese and its nutritional value". Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego 14, n.º 2 (28 de junio de 2018): 37–48. http://dx.doi.org/10.5604/01.3001.0013.5141.
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The study was carried out on samples of raw sheep milk and bundz rennet cheese produced from it. The milk was obtained from ewes of the Koluda prolific dairy breed, from June to August. The sheep were housed indoors and fed with alfalfa green forage and a mixture of concentrate feeds. Three groups were formed for the experiment: group I – control, fed without the addition of herbs to the concentrate feed, and groups II and III, in which an herb mixture was added to the concentrate feed in the amount of 10 and 20 g/sheep/day, respectively. Six experimental batches of bundz rennet cheese were made from the sheep milk, and the effect of the addition of herbs to the sheep diet on the chemical composition of the raw milk, the cheese yield, and its nutritional value was analysed. The results showed that the use of the herbal supplement in the feed of the Koluda prolific dairy sheep in summer had no effect on the chemical composition of the raw milk, and thus its value for processing, expressed as the yield of bundz rennet cheese. Moreover, there was no statistically confirmed influence of the experimental factor on the chemical composition of the cheese. Only a tendency towards lower fat content was noted in the group III cheese in comparison with groups I and II (by 6.5% and 8.0% respectively), which resulted in an improved protein-to-fat ratio (by 7.3% and 9.0% respectively) and lower energy value (by 3.6% and 5.2% respectively). We also noted a tendency towards higher mineral content (ash) in the cheese from groups II and III as compared to group I, by 8.7% and 13.0%, respectively However, these differences were not confirmed statistically, probably due to high intra-group variation in this feature (V% in groups I, II and III: 19.7, 33.7 and 46.1, respectively).
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Bagamaev, Bagama, Eduard Gorchakov, Natalia Fedota, Nikolai Gvozdetsky, Nadegda Taranuha y Natalia Kolomysova. "The balanced diet during the stall period as sheep dermatitis preventing factor". E3S Web of Conferences 164 (2020): 06036. http://dx.doi.org/10.1051/e3sconf/202016406036.
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The intensity and direction of the living organism’s metabolic processes determine the growth rate, development, nutrients synthesis, as well as the reproductive body function and the biosynthesis of proteins, fats and carbohydrates in the form of feedstuff and raw materials. The higher animals’ productivity, the more intensive are metabolic processes. The living bodies’ metabolism proceeds with a certain speed and at the same time contrariwise, but with accurate coherence and interaction due to the participation of “life regulators”, enzymes, which represent the specific proteins, the activity of which is regulated by hormones, vitamins and various synergistic elements. Chemical elements included in the living organism structure are not synthesized in it but must be originated from feeds and other nutrients. Changes in essential micronutrients supply shall not be studied in isolation from the general bio-geochemical situation. Both excess and deficiency may lead to metabolic disorders involving enzyme systems. Knowledge applied by veterinary specialists about the imbalance of various chemical elements in soil, water and feeds has formed the basis for raising the issue of endemic animal diseases diagnosis and prevention. The feeds inadequacy often leads to undernutrition and the reduction of their value in the stall period, which causes the fatness reduction and, therefore, the decrease in mobility and activity, and the weakness of animals. General inspection and palpation of animals reveal ruffled coat, dry-looking and non-supple skin, and if the lack of nutrients becomes more intense, anemic mucous membranes (in more complicated forms even cyanosis and icterus) are observed.
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Cropper, M., M. D. Lloyd y G. C. Emmans. "Nutritional manipulation of lamb growth and its effect on body composition and carcase quality". Proceedings of the British Society of Animal Production (1972) 1986 (marzo de 1986): 71. http://dx.doi.org/10.1017/s0308229600015804.
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The growth rate and body composition of lambs depend on their rate of feed intake and the composition of the feed given. The purpose of the experiment described here was to test predictions of the growth and composition of lambs given feeds of two protein contents at three levels of feeding.73 Scottish Blackface wethers were abruptly weaned at 49 days of age and an average live weight (LW) of 18 (sd 2.2) kg. Six, chosen to cover the range in initial liveweight, were killed and those remaining were put into individual pens and fed in one of six ways. Two feeds with 140g CP/kg fresh weight (FW), called LP, and 220 g CP/kg FW, called HP, were used. They were formulated using barley, maize and soyabean meal, and hay at 150g/kg FW, and were calculated to yield 11.8 MJ ME/kg FW. Each feed was given ad libitum (AL) and at daily rates of 1.2 or 0.8 kg FW. The numbers of sheepstarted were: ALHP, n = 8; ALLP, n = 8; 1.2 HP, n = 12, 1.2 LP, n = 13, 0.8 HP, n = 14, 0.8 LP, n = 12. Sheep were killed from each treatment at 5 kg LW intervals from 25 to 50 kg. After slaughter the weights of gut-fill and organs were taken and the carcase physically dissected into lean, bone and fat. The chemical composition - dry matter and the ash, N, lipid and gross energy contents of the dry matter - of the whole empty body, excluding wool, was measured. Wool weights were determined. The intakes and weights of each sheep were measured twice weekly.