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Literatura académica sobre el tema "Wool Growth Nutritional aspects"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 29 de enero de 2023

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Artículos de revistas sobre el tema "Wool Growth Nutritional aspects"

Tahmasbi, A. M., H. Galbraith y J. R. Scaife. "Development of an In Vitro technique to investigate the role of biotin in regulating wool growth in sheep". Proceedings of the British Society of Animal Science 1996 (marzo de 1996): 183. http://dx.doi.org/10.1017/s1752756200593788.

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The development of in vitro culture techniques (Ibraheem et al, 1993, 1994) for the study of caprine hair follicles has proved useful in elucidating aspects of the control of cashmere and mohair fibre production. There is a similar need to investigate nutritional and other factors which regulate the growth of sheep wool. The aim of the present study was to develop an in vitro technique to study the role of the B-vitamin biotin in controlling growth and viability of sheep wool follicles.

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Tahmasbi, A. M., H. Galbraith y J. R. Scaife. "Development of an In Vitro technique to investigate the role of biotin in regulating wool growth in sheep". Proceedings of the British Society of Animal Science 1996 (marzo de 1996): 183. http://dx.doi.org/10.1017/s0308229600031494.

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Adams, N. R. y S. M. Liu. "Principles of nutrient partitioning for wool, growth and reproduction: implications for nematode parasitism". Australian Journal of Experimental Agriculture 43, n.º 12 (2003): 1399. http://dx.doi.org/10.1071/ea03007.

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The capacity of sheep to withstand and repel intestinal parasites is a neglected component of effective parasite control. The immune response is strongly influenced by the nutritional status of the sheep. However, we are unable take advantage of this to develop effective control programs because we have neither an adequate understanding nor appropriate quantitative data on the impacts of protein and energy on sheep nutrition. This paper reviews some aspects of current knowledge about the impact on immune responsiveness of nutrient flows within the animal as well as hormonal partitioning mechanisms, and assesses research needs in this area. The availability of nutrients to the immune response in the gut is determined by the supply of nutrients to the sheep from both feed intake and body reserves, and the demands of other physiological processes such as growth, wool growth, pregnancy or lactation. Hormones coordinate nutrient flow among these processes. Breakdowns in immunity appear most severe when animals are faced with a demand for growth or lactation, but no single partitioning mechanism can explain all the observations in the field. Therefore, it is unrealistic to seek to establish a hierarchy of partitioning priorities. Protein appears to have a greater impact on immune responsiveness to parasites than energy. However, energy affects the availability of amino acids through a number of mechanisms including protein deposition and mobilisation, so protein supply cannot be considered in isolation. It is appealing to believe that specific limiting nutrients such as sulfur amino acids might explain the relationship between susceptibility to parasites and wool growth, but the experimental evidence for this view is still inconclusive. Rather, it appears that the total flow of nutrients from feed intake and body reserves is more important than specific partitioning mechanisms, or specific limiting nutrients. The potential conflict between role of the gut as a source of mobilisable protein reserves, and the need for protein in the gut to develop local immune responses, need to be explored experimentally. Practical applications of nutritional knowledge are likely to come through improved timing of management procedures rather than better supplements, which are rarely economic. The conclusions outline a number of research questions that must be answered before we can develop programs that integrate immune competence with drenching and other procedures in a holistic way.

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Birrell, HA. "Factors associated with the rate of growth of clean wool on grazing sheep". Australian Journal of Agricultural Research 43, n.º 2 (1992): 265. http://dx.doi.org/10.1071/ar9920265.

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In a grazing study that spanned 2.5 years, the rate of clean wool growth (Wi, g/day) in 4 week periods on Corriedale wether sheep was measured on each side of the animal with dyebands that were applied, alternately, at 2 week intervals. The observations (n = 224) on wool growth from 3 contiguous periods Wi = 1, 2 and 3 with the middle overlapping the other two periods, were related to either the daily rate of organic matter intake (OMI, g/day), the digestible organic matter intake (g DOMI/day), the hourly rate of OMI (IR, g OMI/h) or the hourly rate of digestible organic matter intake (DR, g DOMI/h) in linear or quadratic expressions. The intake data were collected every 4 weeks over the 3 days that correspond to days 6 to 8 of W1. The variance accounted for in each of W1, W2 and W3 increased in the order OMI<DOMI<IR<DR. DR accounted for 33.2% of the variance in W1 with a significant quadratic fit (P < 0.01) and 24.3% and 7.8% with linear fits against W2 and W3, respectively. A relationship that comprised five factors and accounted for 68% of the variance in W1 was developed by nonlinear regression. Three factors that were associated with nutritional aspects, the hourly rate of digestible organic matter intake (DR, g DOMI/h), the organic matter digestibility (OMD %) and the average organic matter intake in a grazing period (M, g OMI/grazing period) accounted for 54.9% of the variance in W1 while the other two factors that were associated with the physiological state of the animal, fleece-free liveweight change (C, g/day) and the fleece-free liveweight (L, kg) accounted for a further 13.1% of the variance of W1. The study suggests that factors associated with phenomena within a daily period may have important effects on wool growth. Management aspects are discussed.

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Adelson, DL, SG Munro y DA Tunks. "Perturbation of wool fibre cell differentiation by a mixture of bromodeoxyuridine and fluorodeoxyuridine". Australian Journal of Agricultural Research 42, n.º 8 (1991): 1293. http://dx.doi.org/10.1071/ar9911293.

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As part of investigations into the pattern of cell division and differentiation in the wool follicle bulb, the thymidine analogue 5-bromo-2'-deoxyuridine was used to label cells in S phase. A mixture of 5-bromo-2deoxyuridine and 5-fluoro-2'-deoxyuridine was injected into sheep held at a constant plane of nutrition. fibre length growth rates were measured by injecting the animals with either 35S-labelled methionine or cysteine, followed by autoradiography of individual fibres. Fibres from 5-bromo-2'-deoxyuridine/5-fluoro-2'-deoxyuridine treated animals exhibited both abnormal cuticle scale patterns and disorganized ortho- and paracortex as determined by staining with methylene blue. Orthocortex differentiation in wool follicle bulb keratogenous zones was visualized using a monoclonal antibody specific for orthocortical cells (HiT 96). We determined that the normal pattern of orthocortical cell differentiation was reversibly inhibited by 5-bromo-2'-deoxyuridine/5-fluoro-2'-deoxyuridine treatment. Fibre length growth rate was reversibly decreased very slightly as a result of 5-bromo-2'-deoxyuridine/5-fluoro- 2'-deoxyuridine administration. We conclude that 5-bromo-2'-deoxyuridine/5-fluoro-2'-deoxyuridine can grossly perturb aspects of wool follicle bulb cell differentiation without profoundly affecting fibre length growth rate. Although 5-bromo-2'-deoxyuridine/5-fluoro-2~-deoxyuridine labelling is an inexpensive, nonradioactive method of visualizing S phase nuclei, the possibility of artefacts resulting from such treatment should be borne in mind.

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Lee, GJ y AJ Williams. "Nutritional responses in wool growth by four Merino genotypes of differing wool growth performance". Australian Journal of Agricultural Research 45, n.º 6 (1994): 1171. http://dx.doi.org/10.1071/ar9941171.

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Sheep from four Merino flocks, different in annual clean fleece production when grazed together, were offered a range of nutritional treatments to compare their ability to digest dietary organic matter (experiment 1) and to compare the relationships of wool growth and fibre diameter with nutrient intake (experiment 2). The sheep were selected from a finewool (Fl), a strong wool (S), and two medium-Peppin (MP6 and MP10) flocks. The nutritional treatments varied intakes of two pelleted diets-B and F. Diet B consisted of oat grain, lucerne chaff, and oaten straw, while diet F was as for B but fortified with fishmeal. The digestibility of both diets was negatively related to the level of intake, and there were some differences between the flocks in their ability to digest organic matter. Clean wool growth per unit area of skin was curvilinearly related (P < 0.001) to N intake, but was not influenced by diet per se. The regression coefficient for the relationship of clean wool growth with N intake and the estimated maximum wool growth rate of flock F1 were less than the other flocks. However, flock MP10 grew less wool than flocks S and MP6 at any given intake. Variation in (fibre diameter)2 accounted for 0.6 of the variation in wool growth, with responses in fibre diameter to intake being similar to those observed in wool growth. The responses in plasma cystine of the flocks to N intake differed, with the relationship for flock F1 being curvilinear and reaching a maximum at an intake of 27 g N day-1, while the responses of the other flocks were essentially linear. The relationships between plasma cystine level and wool growth differed between the flocks such that wool growth of sheep from flocks S and MP6 was more responsive to increased plasma concentration of cystine.

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García-Ruiz, E., V. Marco y I. Pérez-Moreno. "Laboratory rearing and life history of an emerging grape pest, Xylotrechus arvicola (Coleoptera: Cerambycidae)". Bulletin of Entomological Research 102, n.º 1 (6 de septiembre de 2011): 89–96. http://dx.doi.org/10.1017/s000748531100040x.

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AbstractSeveral aspects of the biology of Xylotrechus arvicola (Olivier), an emerging grape pest, were studied under laboratory conditions. Four diets were tested to rear this species in the laboratory. Among them, only one made rearing from larva to adult possible. The highest mortality, in all cases, was recorded during the first days of larval development. Larvae were kept 45 days at 8°C to break diapause in order to reduce the normal field larval developmental time. The species' developmental time was similar between sexes, while pupal developmental time and weight were significantly greater for females than for males. As part of a complementary study, life table parameters of females obtained from the larvae reared on the artificial diet were compared to those of females emerged from field-infested grape root wood. Both laid the majority of eggs in the first two weeks after emergence, and they had a similar pre-laying period. Nevertheless, the females from the diet-reared larvae lived significantly longer, laid eggs over a longer period of time and showed higher fertility than those emerging from infested grape root, suggesting that diet fulfils larval nutritional needs. The species’ laboratory-reared population exhibited a low intrinsic growth rate value (rm=0.01) as a result of its long egg-to-adult developmental time and its high larval mortality.

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Hynd, P. I. "The nutritional biochemistry of wool and hair follicles". Animal Science 70, n.º 2 (abril de 2000): 181–95. http://dx.doi.org/10.1017/s1357729800054655.

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AbstractThe rôle of various classes of nutrients (energy substrates, vitamins, minerals, amino acids) in the production of wool and hair from follicles, is considered for a variety of animal species. The wool and hair follicle have evolved a number of interesting features of carbohydrate metabolism including glutaminolysis, aerobic glycolysis, significant activity of the pentose phosphate pathway, and storage and mobilisation of glycogen. Presumably the necessity to continue to produce fibre despite fluctuations in the supply of oxygen and nutrients has resulted in some of these unique features, while others reflect the high level of DNA and protein synthesis occurring in the follicle. While it is considered that energy does not normally limit fibre growth, the relative contributions of aerobic and anerobic metabolism will greatly influence the amount of ATP available for follicle activity, such that energy availability may at times alter fibre growth. Alopecia and deficient fibre growth are consistent outcomes of deficiencies of biotin, riboflavin, pyridoxine, folate and pantothenic acid, but the precise rôles of these vitamins in follicle function await elucidation. Folate, in particular appears to play an important rôle in wool production, presumably reflecting its involvement in methionine metabolism. Cholecalciferol (vitamin D) significantly alters fibre growth in cultured follicles; vitamin D receptors are located in the outer root sheath, bulb, and dermal papilla of the follicle; and alopecia occurs in humans with defects in the vitamin D receptor. Retinol (vitamin A), too, appears to influence follicle function by altering keratinocyte proliferation and differentiation, with direct effects on the expression of keratin genes. The receptors for the retinoids are present in the keratogenous zone, the outer root sheath, the bulb, and the sebaceous glands. Vitamin A may also act indirectly on follicle function by influencing the activity of the insulin-like and epidermal growth factors and by altering vitamin D activity. At present there is little evidence implicating alpha-tocopherol (vitamin E) or phytylmenaquinone (vitamin K) in follicular events. Of the minerals, only copper and zinc have been shown to have direct effects on follicle function, independent of effects on food intake. Copper has direct effects on the activity of an unidentified enzyme on oxidation of thiol groups to form disulphide linkages. Wool produced by copper-deficient sheep lacks crimp, is weak and lustrous. Copper is also necessary for the activity of tyrosinase and the tyrosinase-related proteins involved in melanin synthesis. Zinc, like copper, is required for the normal keratinization of fibres but again, the precise rôle has yet to be elucidated. While the importance of amino acid supply for wool growth has long been established, there are still some unaswered questions such as; what are the effects of amino acids on fibre growth in animals other than sheep; what are the characteristics of the amino acid transport genes and proteins operating in the wool and hair follicle; and what are the specific rôles for amino acids in follicle function.

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Williams, AJ y RJ Winston. "A study of the characteristics of wool follicle and fibre in Merino sheep genetically different in wool production". Australian Journal of Agricultural Research 38, n.º 4 (1987): 743. http://dx.doi.org/10.1071/ar9870743.

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Fourteen Merino ewes from each of two flocks, selectively bred for either high (Fleece Plus) or low (Fleece Minus) clean fleece weight per head, were randomly allotted to two feeding levels (17 v. 34 g kg-1 liveweight) of a good quality diet and offered these levels for 100 days. During the final 42 days, the rate of wool growth and its components were measured in each sheep. The Fleece Plus sheep had a greater density of wool follicles and produced more wool per unit area of skin. The latter trait interacted with the nutritional level; Fleece Plus sheep were more responsive to the higher nutritional level (45 v. 13%). Both the rate of growth of fibre length and the diameters of fibres produced in secondary follicles were the components associated with this interaction. The sulfur content of the wool was 12% less in wool from Fleece Plus ewes, but the difference between the two flocks was unrelated to the nutritional level. The average diameter (c. 83 8m) of the bulbs of the follicles did not differ between flocks or dietary levels, but follicles in the skin of Fleece Plus sheep were deeper (P < 0.05) below the skin surface (1.52 v. 1.38 mm). Despite the similar maximum bulb diameters, random longitudinal sections of follicles from Fleece Plus sheep had a 10% greater area of mitotically active tissue (P < 0.05). The difference was independent of nutritional level. When colchicine (10 8g) was injected intradermally, the number of cells revealing metaphase arrest within the mitotically active area of the follicle increased linearly with time to 6 h after the injection. The rate of increase in these cells expressed per unit volume of bulb tissue was not however influenced by either genotype or nutritional level. The average volume of cortical cells isolated from the fibres did not differ between genotypes or nutritional levels, but as with fibre volume, the volume of the cortical cells of the Fleece Plus sheep was more sensitive to a change in nutritional level (interaction: P < 0.05). Calculation of the rate of incorporation of cortical cells into fibre from both rate of production of fibre and the size of the cortical cells indicated that 20% more cells were incorporated by the Fleece Plus sheep and 17% more cells were incorporated by those sheep offered the greater dietary allowance. There was no significant interaction between genotypes and nutritional level for this trait.

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Butler, LG y GM Head. "Photoperiodic rhythm of wool growth and its contribution to seasonal wool production by the Merino, Polwarth, and their reciprocal crosses in southern Australia". Australian Journal of Experimental Agriculture 34, n.º 3 (1994): 311. http://dx.doi.org/10.1071/ea9940311.

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Twelve wethers of each of the Merino and Polwarth breeds and their reciprocal crosses were fed at1 of 2 levels in individual pens for 14 months. Periodic clean wool weight, yield, fibre diameter, and the coefficient of variation (CV%) for fibre diameter were measured from midside patches harvested every6 weeks.There was a significant effect of time of wool harvest on clean wool weight per cm2, yield, fibre diameter(all P<0.01), and its CV% (P<0.05). A trough in wool production occurred about August-September and a peak in January. The amplitude of the photoperiodic rhythm of wool growth (difference between maximum and minimum wool growth per cm2 per 42 days as a percentage of the average) was 40%. Yield also displayed a substantial photoperiodic rhythm, but that of fibre diameter was less pronounced. Mean staple strength was 32.3 N/ktex, the mean break occurring at a distance of 60% of the staple length from the tip; there was no effect of genotype or level of feeding. From comparison with published Tasmanian field data, the seasonal wool growth pattern of sheep at pasture appears similar to the photoperiodic rhythm but occurs about a month earlier. It was concluded that the photoperiodic rhythm of wool production of Tasmanian Merino-based breeds should not be a barrier to manipulation of wool quality (staple strength and fibre diameter) by nutritional management.

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Tesis sobre el tema "Wool Growth Nutritional aspects"

Bray, Megan. "Regulation of wool and body growth : nutritional and molecular approaches". Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phb8267.pdf.

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"May 2002" Includes bibliographical references (leaves 148-164) Describes a series of novel experiments designed to enhance our understanding of nutrient utilisation for growth of wool and the whole body.

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Relf, Bronwyn Lee, University of Western Sydney y School of Science. "Isolation and characterisation of genes expressed in the wool follicle". THESIS_XXX_SS_Relf_B.xml, 1999. http://handle.uws.edu.au:8081/1959.7/529.

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Wool from Merino sheep is an important component of the Australian economy. However, little is known of the mechanisms within the wool follicle that regulate fibre production. The aim of the research described here was to identify and characterise some of the genes expressed in the follicle.A highly expressed gene has been identified from skin and sequenced. The information obtained on this gene suggests that it might be of use in future transgenic studies. Two cDNA libraries were constructed. The first was constructed using small amounts of total RNA from skin and PCR methodology, following a published method. A second cDNA library was then produced from adult mid-flank skin using a commercially available kit. A pool of 420 potential wool follicle specific transcripts were identified from this adult mid-flank skin cDNA library using a combination of differential and subtractive screening. Clone 1-25 was chosen as the focus for the remaining work described in this thesis. Expression of clone 1-25 was detected at all stages of wool follicle development and was localised to the wool follicle bulb, inner root sheath, outer root sheath, epidermis, but not the dermis or dermal papilla. The function of clone 1-25 is as yet unknown. However, from its expression in the wool follicle, and studies by other groups, it appears that it may play a role in inducing differentiation
Doctor of Philosophy (PhD) (Biological Sciences)

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Fergusson, Marjorie. "Comparison of dietary fructose versus glucose during pregnancy on fetal growth and development". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59400.

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Dietary carbohydrate during pregnancy is essential but whether this requirement is specific to glucose or if fructose could substitute for glucose in the diet of pregnant rat dams was investigated. It was concluded that the carbohydrate requirement for the rat during pregnancy is not specific to glucose and the level, not the type, of carbohydrate was critical. The potential toxicity of high fructose diets was also investigated. Dams fed high fructose had significantly higher liver weights than dams fed high glucose while other toxic indicators were not affected. A third aspect was the comparison of isocaloric, low carbohydrate diets containing different sources of 4% glucose equivalents: glucose, fructose or lipid-glycerol. Fructose and lipid-glycerol were not adequate substitutes for glucose. The measurement of amniotic fluid glucose, which increased as either dietary glucose or fructose increased in the maternal diet may be a new, accessible nutritional indicator of carbohydrate status.

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Cobrin, Mona. "The interaction of the level of dietary carbohydrate and exercise intensity during pregnancy on fetal growth and development /". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69760.

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Since glucose is the principal substrate used during exercise and is also the main metabolic fuel for the developing embryo and fetus, exercising during pregnancy could induce a competition for fuel between fetus and exercising muscles, perturbing glucose homeostasis. To determine if exercise during pregnancy would predispose the fetus to increased risk, pregnant rats were randomly assigned to a low (4%), moderate (12%) or high (60%) carbohydrate diet, and either rested or exercised on a rodent treadmill at a moderate (15.5 m/min) or high (24.3 m/min) intensity from day 16-21 of gestation. When food intake was controlled for in the statistical model as a covariate, the level of maternal dietary carbohydrate significantly influenced maternal liver weight, heart glycogen, insulin, amniotic fluid glucose and lactate, but not maternal plasma glucose, liver or skeletal muscle glycogens. In contrast, a restricted level of maternal dietary carbohydrate, lowered fetal weight as well as fetal plasma glucose, insulin and liver glycogen. Exercise intensity significantly altered only maternal lactate levels. The results indicate that acute exercise during pregnancy can have detrimental effects on fetal development only if carbohydrate energy is restricted. Otherwise, adequate carbohydrate in the maternal diet appears to protect the fetus.

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Fraser, Keely Gabrielle. "Impact of macronutrient restriction and probiotic supplementation on protein synthesis and growth in a piglet model of dextran sulphate-induced colitis". Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99178.

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A dextran sulphate (DS) model of ulcerative colitis was used to examine the effects of macronutrient restriction with (MR+PRO) and without (MR) probiotic supplementation (VSL#3RTM) on protein metabolism and growth. MR and MR+PRO decreased weight and chest circumference gain, but had no effect on linear growth of piglets. MR decreased the protein fractional synthesis rate (FSR) of liver, masseter, longissimus dorsi, colon, as well as plasma albumin, measured by stable isotope tracer L-[ring-2H 5]phenylalanine. MR+PRO increased the FSR of hepatic proteins by greater than 70% and increased both the FSR and absolute synthesis rate (ASR) of the total plasma protein pool, albumin and fibrinogen. Over 11 days, MR+PRO piglets showed a smaller decrease in plasma total protein concentrations than WN piglets, and maintained higher albumin levels than either WN or MR piglets. These findings highlight the importance of adequate nutrition during gastrointestinal inflammation and show that when food intake is decreased, probiotics stimulate liver protein synthesis and increase the acute phase protein response, similar to the well-nourished state.

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Burr, Laura Lynn. "Diet enrichment with arachidonic and docosahexaenoic acid during the lactation period attenuates the effects of intrauterine growth restriction from birth to maturity in the guinea pig and improves maternal bone mass". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112384.

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Intrauterine growth restriction (IUGR) reduces bone mass by 10-30% and impairs arachidonic (AA) and docosahexaenoic (DHA) acid status in infants. Because AA and DHA enhance neonatal bone mass, the aim of this study was to determine the effects of dietary 0.5% AA and 0.2% DHA (w/w) prior to weaning on bone and growth. 40 guinea pigs were randomized to either a control (C) or low-protein diet (LP) during pregnancy and the C diet or the C diet with AA+DHA during lactation. Measurements included bone mass, metabolism, and strength, and erythrocyte lipid of sows and offspring from birth to 16 wk post-partum. The LP diet induced IUGR, while the AA+DHA increased bone mass by 5-20% in sows and offspring and corrected growth and bone mass in IUGR pups. Thus, AA+DHA provided in lactation rescues the growth trajectory in an IUGR state and is beneficial to maternal and neonatal bone mass.

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Muscati, Siham K. (Siham Khalili). "Balance between fetal growth and maternal weight retention : effects of maternal diet, weight and smoking behaviour". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40405.

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The interrelation among maternal dietary intake, pregravid weight, amount and pattern of gestational weight gain and cigarette smoking in influencing the balance between fetal growth and maternal postpartum weight retention was in investigated in 1,330 healthy participants in the PEI Nutritional Counselling Program. Among nonsmokers, gestational weight gain was the main predictor of postpartum weight retention and explained 65.3% of its variability, while explaining only 4.7% of infant birth weight variability. Women with higher postpartum weight retention gained more weight during pregnancy and most of the difference between higher and lower weight retention groups occurred in the first 20 weeks. When comparing infant size between smoking and nonsmoking mothers, birth weight increased linearly with maternal weight gain in all weight status groups except in overweight nonsmokers where birth weight reached a plateau at weight gains $>$17 kg. Among smokers, infant length increased at a higher rate with weight gain than nonsmokers. Although higher weight gains seemed to partially mitigate the effect of smoking on the risk of small-for-gestational-age (SGA) infants, such risk remained $>$10% at elevated weight gains among underweight smokers. The effects of smoking in reducing maternal and infant weights were not mediated by lower energy intake, as smokers consumed more energy than nonsmokers after controlling for physical activity and pregravid weight. The independent relative risks of SGA infants due to maternal smoking, pregravid underweight and low weight gain, were 3.23, 1.80 and 1.72 respectively, implying that smoking has the greatest effect on SGA. Based on current smoking prevalence in Canada, the population etiologic fraction of SGA due to the direct effect of smoking is 30.8%; approximately twice that for maternal underweight or low weight gain. Efforts to increase infant birth weight through higher maternal weight gain would require impractically high ene

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Anderson, Susan A. "Maternal dietary glucose intake affects neonatal gastrointestinal development in rats". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0029/MQ50707.pdf.

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Whitmore, Erika. "Influence of maternal diet on the developmental profile of postnatal glucose transporters". Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21664.

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To test the hypothesis that maternal dietary glucose restriction throughout pregnancy and lactation would perturb glucose transporter (GLUT) protein levels in offspring, isoenergetic diets containing graded levels of glucose (0, 12, 24 and 60%) were fed to pregnant rats and their offspring from gestation day (gd) 0 through postnatal day (pd) 49. Diets were defined as deficient (0%), restricted (12, 24%) or adequate (60%) in glucose. Plasma, small intestine, liver and kidney tissues were collected perinatally (gd20, birth, 12--24hrs postnatal), during lactation (pd7, 15, 21), post-weaning (pd28, 35, 49) and in adult controls. The proximal and distal regions of the small intestine responded differently to the dietary glucose restriction. Proximal small intestine GLUT2 protein levels did not change throughout postnatal development and remained unaltered with dietary glucose restriction, while distal small intestine GLUT2 protein expression changed throughout postnatal development and with dietary glucose restriction. These findings, together with information from the literature, indicate a dissociation between small intestine GLUT2 mRNA expression, GLUT2 protein levels and small intestine glycogen reserves.

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Comstock, Sarah Michelle. "Examining the Effect of Maternal High-Fat Diet Consumption on the Physiology and Pancreas Development of Fetal and Juvenile Nonhuman Primate Offspring". PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/551.

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The purpose of these studies was to investigate the impact of high-fat diet (HFD) exposure during pregnancy and the early post-natal period on fetal and post-natal development of the endocrine pancreas of the Japanese macaque. Specifically I hypothesized that the HFD would alter islet morphology and lead to disturbances in glucose homeostasis in these animals. Adult female Japanese macaques were placed on either a control (CTR) or HFD diet for 4 years. Fetuses were collected at gestational day 130 (G130), while other offspring from the CTR and HFD mothers were carried to term. After birth, infant animals were maintained with their mothers on the same diet then weaned onto either the CTR or HFD diet for five months. Animals were studied up to 13 months of age, yielding 4 postnatal groups: CTR/CTR, CTR/HFD, HFD/CTR and HFD/HFD. Pancreata were collected from these offspring for gene expression and immunohistochemical analysis. Physiological measurements, including body weight, body fat percentage, fasting glucose, insulin, glucagon and response to intravenous glucose tolerance tests (IVGTTs) and an intravenous insulin tolerance test (IVITT) were collected from the post-natal offspring. Total fetal islet mass and β cell mass were not changed, but α cell mass was significantly decreased in HFD fetuses, leading to a significant increase in the β cell to α cell ratio in HFD fetal offspring. The HFD offspring displayed a significant change from CTR offspring in expression of genes involved in glucose homeostasis and islet neogenesis, including PDX1, NeuroD, Glucokinase and Glut2. Postnatal HFD animals were significantly heavier than CTR offspring and had increased adiposity by 6-7 months of age. There was no significant effect on fasting or stimulated insulin secretion at this time point, but HFD offspring were significantly insulin resistant just prior to weaning. At 13 months of age, basal and glucose-stimulated insulin secretion were elevated in HFD/HFD animals and the CTR/HFD group displayed moderate insulin resistance. There was also a significant sex effect, with males from the HFD/CTR and HFD/HFD group having increased body weight and elevated fasting glucose. Although pancreata from both the HFD/HFD and CTR/HFD animals displayed significant changes in expression of genes involved in glucose homeostasis, the pattern was distinct for the two groups. Islet mass was also elevated in both of these groups; yet, HFD/HFD only displayed an increase in β cell area, while CTR/HFD had a concomitant increase in α cell area, which served to normalize the β cell to α cell ratio to control levels. In contrast, the HFD/HFD group exhibited a 40% increase in the β cell to α cell ratio. These studies demonstrate that in-utero exposure to a HFD leads to decreased α cell plasticity in response to chronic post-natal HFD consumption. Animals exposed to the HFD during pregnancy and the early post-natal period become insulin resistant, but remain normoglycemic. HFD consumption during the post-weaning period causes similar complications in glucose homeostasis and islet mass in both the CTR/HFD and HFD/HFD animals. However, there are distinct differences in the molecular and cellular adaptive response between these two groups.

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Libros sobre el tema "Wool Growth Nutritional aspects"

Nutrient, Regulation during Pregnancy Lactation and Infant Growth (1992 Stockholm Sweden and Helsinki Finland). Nutrient regulation during pregnancy, lactation, and infant growth. New York: Plenum, 1994.

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Marabou Symposium (16th 1995 Sundbyberg, Sweden). Early nutrition and lifelong health. Washington, D.C: International Life Sciences Institute, 1996.

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Ingestad, Torsten. Data base for tomato plants at steady-state: Methods and performance of tomato plants (Lycopersicon esculentum Mill. cv. Solentos) under non-limiting conditions and under limitation by nitrogen and light. Uppsala: Institutionen för ekologi och miljövård, Sveriges lantbruksuniversitet, 1994.

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International Symposium on Nutrition, Growth, and Cancer (1st 1987 Athens, Greece). Nutrition, growth, and cancer: Proceedings of the First International Symposium on Nutrition, Growth, and Cancer, held in Athens, Greece, April 26-30, 1987. Editado por Tryfiates George P, Prasad Kedar N, International Association for Vitamin and Nutritional Oncology. y Ethnikon Hidryma Ereunōn (Greece). New York: Liss, 1988.

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International Symposium on Nutrition, Growth, and Cancer (1st 1987 Athens, Greece). Nutrition, growth, and cancer: Proceedings of the First International Symposium on Nutrition, Growth, and Cancer, held in Athens,Greece, April 26-30, 1987. Editado por Tryfiates George P, Prasad K. N, International Association for Vitamin and Nutritional Oncology. y Ethnikon Hidryma Ereunōn (Greece). New York: Liss, 1987.

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Liang, duo. Kan, wo zhang gao le!: Zeng gao jiao xing bao dian. Chengdu: Cheng du shi dai chu ban she, 2007.

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Miriam, Erick, ed. D.I.E.T. during pregnancy: The complete guide and calendar. Brookline, MA: Grinnen-Barrett Pub. Co., 1987.

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editor, Battro Antonio M., Potrykus, I. (Ingo), 1933- editor y Sánchez Sorondo Marcelo editor, eds. Bread and brain, education and poverty: 4-6 November 2013. Vatican City: Pontificia Academia scientiarum, 2015.

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Prenatal and childhood nutrition: Evaluating the neurocognitive connections. Oakville, ON: Apple Academic Press, 2015.

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1946-, Allen Lindsay, King Janet 1941- y Lönnerdal Bo 1938-, eds. Nutrient regulation during pregnancy, lactation, and infant growth. New York: Plenum Press, 1994.

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Capítulos de libros sobre el tema "Wool Growth Nutritional aspects"

Jones, Nicola, Helen L. Lambert, Richard Eastell y Margo E. Barker. "Bone Growth in Childhood and Adolescence: The Interpretation of Dietary Supplementation Trials". En Nutritional Aspects of Osteoporosis, 50–55. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-2228-6_5.

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Samson, Leslie. "Angora wool production." En Rabbit production, 292–302. 10^a ed. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249811.0022.

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Abstract This chapter highlights the different aspects of Angora wool production which includes: wool coat growth and yield; management; wool block (gastric statis); equipment for grooming and wool harvesting; removal of wool; care of shorn rabbits; grading and sorting of Angora wool; and home-spinning of Angora wool.

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Oddy, W. H. "Transforming growth factor-β in milk". En Handbook of dietary and nutritional aspects of human breast milk, 417–36. The Netherlands: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-764-6_23.

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Abitbol, Carolyn, Michael Freundlich, Gaston Zilleruelo y Jose Strauss. "Nutritional Aspects of Growth in Children with Congenital Renal Anomalies". En Persistent Renal-Genitourinary Disorders, 187–91. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-2339-6_17.

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Clemmons, David R., David K. Snyder y Louis E. Underwood. "Interaction of Growth Hormone and Nutritional Intake in Facilitating Nitrogen Conservation and Promoting Lipolysis". En Basic and Clinical Aspects of Growth Hormone, 347–55. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-5505-2_33.

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Bartok, C. J. "Growth of infants fed breast milk by bottle". En Handbook of dietary and nutritional aspects of human breast milk, 117–32. The Netherlands: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-764-6_06.

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Ozgurtas, T. "Breast milk soluble vascular endothelial growth factor receptor-1 and implications for health". En Handbook of dietary and nutritional aspects of human breast milk, 437–46. The Netherlands: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-764-6_24.

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Zimmermann, Andrea y George Rapsomanikis. "Trade and Sustainable Food Systems". En Science and Innovations for Food Systems Transformation, 685–709. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15703-5_36.

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AbstractTrade is an integral part of our food systems. It connects people at all stages of agricultural and food value chains, linking farmers with consumers across the world. It also links nations to each other, and thus scales up from the domestic to the global perspective. By moving food from surplus to deficit regions, trade promotes food security, the diversity of foods available, and can affect preferences and diets. Trade impacts food prices and the allocation of resources, and thus is inherent to economic growth and interacts with the environment. At the same time, trade can create both winners and losers, resulting in inequality, and can generate negative social and environmental outcomes. This chapter provides an overview of the current debate around trade in food and agriculture and illustrates the role that trade can play within food systems in balancing different dimensions of sustainability. While trade openness is generally conducive to food security and promotes economic growth, formulating trade policies to achieve multiple targets, including environmental, nutritional and social objectives, requires careful analysis. Trade policies may not be the best and most efficient instruments for achieving multiple objectives, and they should be framed by complementary policies targeting specific aspects of sustainability. For example, in addressing climate change, one of today’s most pressing challenges, a combination of food trade and domestic policy instruments can sharpen the adaptation and mitigation roles of trade and significantly contribute to promoting the adoption of climate-smart technologies. In order to effectively design such policies, a better understanding of both the complex linkages between trade and sustainability outcomes and the simultaneous impacts of policy approaches on all parts of the food system will be necessary.

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Nnamani, C. V., D. B. Adewale, H. O. Oselebe y C. J. Atkinson. "African Yam Bean the Choice for Climate Change Resilience: Need for Conservation and Policy". En African Handbook of Climate Change Adaptation, 453–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_203.

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AbstractGlobal warming has emerged as a major challenge to development and human wellbeing in Sub-Saharan Africa in general and Nigeria in particular. Periodic incidents show that this challenge will continue and increase in impact on all aspects of natural resources – agriculture, ecosystems services, biodiversity depletion, environmental degradation and human health. Recognizing the enormous potential of underutilized plant genetic resources (PGRs) is crucial as sources of solutions to a number of these threatening challenges emanating from climate change (food and nutrition insecurity, genetic erosion, loss of agro-biodiversity, green job growth and income generation) cannot be over-emphasized. Sphenostylis stenocarpa (Hochst. ex. A. Rich) Harms., commonly known as African yam bean (AYB) belonging to the leguminous Fabaceae, is an underutilized PGR with rich portfolio which could serve as vital source of robust adaption and resilient germplasm for vulnerable local communities in Nigeria. Its substantial nutritional, environmental, cultural, social, medicinal, industrial and soil restorative potentials underpins its position as climate – smart species. Enhancing the potentials of African yam bean via robust innovative approaches for wider utilization through accelerated research, farmer seed exchanges, in-situ and ex-situ conservations, farmers selection, and policy programs such as seed sovereignty will accentuate its adaptation and used as resilient climate –smart species for the vulnerable groups in Nigeria to cushion impact of climate change.

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Informes sobre el tema "Wool Growth Nutritional aspects"

Provenza, Frederick, Avi Perevolotsky y Nissim Silanikove. Consumption of Tannin-Rich Forage by Ruminants: From Mechanism to Improved Performance. United States Department of Agriculture, abril de 2000. http://dx.doi.org/10.32747/2000.7695840.bard.

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Trees and shrubs are potentially important sources of food for livestock in many parts of the world, but their use is limited by tannins. Tannins reduce food intake by decreasing digestibility or by causing illness. Supplementing cattle, sheep, and goats with polyethylene glycol (PEG), which has a high affinity for binding tannins and thus attenuating their aversive effects, increases intake of high-tannin foods and improves weight gains and wool growth. The objectives of this proposal were: Objective 1: To further delineate the conditions under which PEG affects intake of high-tannin foods. Objective 2: To ascertain if animals self-regulate intake of PEG in accord with the tannin content of their diet under pen, paddock, and field conditions. Objective 3: To determine how nutritional status and PEG supplementation affect preference for foods varying in nutrients and tannins. Objective 4: To assess the effects of PEG on food selection, intake, and livestock performance in different production systems. The results from this research show that supplementing livestock with low doses of PEG increases intake of high-tannin foods and improves performance of cattle, sheep, and goats. Neutralizing the effects of tannins with supplemental PEG promotes the use of woody species usually considered useless as forage resources. Supplementing animals with PEG has the potential to improve the profitability - mainly milk production - of high-yielding dairy goats fed high-quality foods and supplemented with browse in Mediterranean areas. However, its contribution to production systems utilizing low-yielding goats is limited. Our findings also support the notion that supplemental PEG enhances the ability of livestock to control shrub encroachment and to maintain firebreaks. However, our work also suggests that the effectiveness of supplemental PEG may be low if alternative forages are equal or superior in nutritional quality and contain fewer metabolites with adverse effects.

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