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Academic literature on the topic 'Ewes'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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Journal articles on the topic "Ewes"

1

MENEGATOS (Ι. ΜΕΝΕΓΑΤΟΣ), J., E. XYLOURI (Ε. ΞΥΛΟΥΡΗ), A. AJOUTANTI (Α. ΑΓΙΟΥΤΑΝΤΗ), O. SABATAKOU (Ο. ΣΑΜΠΑΤΑΚΟΥ), E. PARASKEVAKOU (Ε. ΠΑΡΑΣΚΕΥΑΚΟΥ), and E. VAINAS (Ε. ΒΑΪΝΑΣ). "Two cases of freemartinism in Lacaune ewes." Journal of the Hellenic Veterinary Medical Society 55, no. 4 (December 6, 2017): 299. http://dx.doi.org/10.12681/jhvms.15119.

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In this study the anatomy of the genital system, the histology of gonads, the reproductive behavior and the chromosome examinations of two freemartin Lacaune ewes were described. The appearance of these ewes resembled that of a ram, but their external genitalia were female with an enlarged clitoris. The gonads were small testicles located subcutaneously in the prepubic region. In the case of the ewel the testicles were palpated with difficulty, while in ewe 2 they were almost atrophic. In both cases there were epididymides, but in ewe 2 the ends of vasa differentia were joined. In ewel there were vesicular and bulbo-urethral glands. In ewe 2 the vesicular glands were absent. The ewel had male sexual behavior, but the ewe 2 had a neutral one. The histological examination of the gonads of ewe 1 showed excessive development of the vassoconnective tissue, where a small number of seminiferous tubules and Sertoli cells were also visible. The gonads of ewe 2 showed excessive fibrosis. The results of chromosome examination showed chimaerism (54,XX/XY) in both cases. The XY cells were 63% and 61% for the ewes 1 and 2, respectively. The rest cells 37% and 39% were respectively XX ones.

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Schreurs, N. M., P. R. Kenyon, P. C. H. Morel, and S. T. Morris. "Meta-analysis to establish the response of having heavier mature ewes during gestation on the birthweight of the lamb and the weaning weight of the ewe and lamb." Animal Production Science 52, no. 7 (2012): 540. http://dx.doi.org/10.1071/an11292.

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There is much uncertainty about feeding ewes to maximise the performance of progeny and of the ewe itself to weaning. This includes questions about feeding the ewe to influence the lamb’s birthweight for lamb survival, feeding to augment the ewe’s lactation to maximise the lamb’s growth potential before weaning and feeding the ewe to increase the probability of having multiple offspring. The objective of this study was to carry out a meta-analytic study to consider the response of having heavier mature ewes during gestation on lamb and ewe performance measured by birth and weaning weights. The birthweight of singleton lambs was the greatest, twins were intermediate and triplets the lowest (5.8, 4.8 and 4.1 kg, respectively; P < 0.001). A similar trend (P < 0.001) was observed for the weaning weight of the lamb (29.1, 25.2 and 23.7 kg for lambs weaned as a single, twin or triplet, respectively). The liveweight of ewe at weaning was greater (P < 0.001) for those ewes that failed to wean a lamb (69.6 kg) or weaned a single lamb (67.8 kg) compared with ewes that weaned twin and triplet lambs (64.8 and 65.3 kg; respectively). A greater ewe liveweight during gestation gave different responses on the lamb birthweight, lamb weaning weight and the weaning weight of the ewe and this was dependent on birth and weaning rank category of the lamb (P < 0.05). Overall, the response of heavier ewes on lamb birthweights and ewe and lamb weaning weights was small compared with the effect of birth and weaning rank of the lamb.

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Vatankhah, M., and F. Zamani. "Phenotypic and genetic characteristics of longevity in Lori-Bakhtiari sheep." Biotehnologija u stocarstvu 23, no. 5-6-1 (2007): 323–29. http://dx.doi.org/10.2298/bah0701323v.

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Longevity records of 978 Lori-Bakhtiari ewes were collected from a research flock at the Lori-Bakhtiari sheep breeding station during 1989 to 2006. Single-trait animal model used to analyze trait, included fixed effects of year of production, ewe body weight as covariable and random effects additive genetic of animal and residual effects. Phenotypic and genetic trends were estimated as regression of average phenotypic value and breeding value by birth year of ewe. Results show that, 49.80%, 22.49% and 27.71% of breeding ewes left the flock for illness, low production and oldness respectively. The overall mean (? s.e.) of ewe's longevity was 1779.91 (22.10) days. The effect of year of production and ewe's body weight on longevity were significant (p<0.01), and longevity increased by 41.84 ? 2.80 days with 1 kg of ewe body weight. Estimation of heritability for longevity was 0.33 ? 0.07. The phenotypic and genetic trends of longevity were significant (P<0.01) and estimated as -84.65 and -19.02 days, respectively. Thus, illness is very important reasons to removed ewes from flock. Longevity could be improved by selection, but early life traits is needed to indirect selection for longevity.

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Alexander, G., D. Stevens, and LR Bradley. "Fostering in sheep: fostering lambs onto ewes whose lambs have died soon after birth." Australian Journal of Experimental Agriculture 27, no. 6 (1987): 765. http://dx.doi.org/10.1071/ea9870765.

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Fostering, in which the odour of the foster lamb was made similar to that of the ewe's own lamb, was attempted with Merino and crossbred (Border Leicester x Merino) ewes whose lambs had been killed 30 min post partum to simulate natural early post partum death. Hessian coats were fitted at the time of death to the lambs of 11 ewes, and 2-1 8 h later the coats were transferred to foster lambs which were then presented to the respective ewes. The dead lambs of another 11 ewes were smeared with neatsfoot oil at the time of death and were left with their mothers for 2-18 h at which time they were substituted by foster lambs freshly smeared with neatsfoot oil. In another group of 11 ewes the skin of the dead lamb was draped about a foster lamb that was given to the ewe 2-18 h post partum. Foster ewes accepted 73 and 91% respectively of lambs treated with hessian coats or neatsfoot oil, compared with 36% in control ewes with untreated lambs, while fostering by the traditional shepherd's method of draping the skin of the dead lamb over the foster lamb was 100% successful. However, the success rates in the 3 treatments were not significantly different. Some success was also achieved in a supplementary group of 8 ewes when application of neatsfoot oil to the dead lamb was delayed until about 2 h prior to fostering. There was no indication that success rates were influenced by the genotype of the ewe or by restraining ewes overnight with the lamb having access to the udder. The traditional method of skinning the dead lamb appears to be the method of choice, because the dead lamb does not have to be found and treated prior to fostering.

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Caroprese, Mariangela, Giovanni Annicchiarico, Laura Schena, Antonio Muscio, Raffaella Migliore, and Agostino Sevi. "Influence of space allowance and housing conditions on the welfare, immune response and production performance of dairy ewes." Journal of Dairy Research 76, no. 1 (October 16, 2008): 66–73. http://dx.doi.org/10.1017/s0022029908003683.

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The experiment used 45 Comisana ewes, divided into 3 groups of 15. The aim was to determine the effects of two different stocking densities and two different housing conditions on welfare, and on production performance of dairy ewes. The stocking densities tested were: high stocking density (1·5 m2/ewe, HD group) and low stocking density (3 m2/ewe, LD group); the two housing conditions tested were: ewes housed indoors (LD group, 3 m2/ewe) and ewes allowed to use an outdoor area (LDP group, 3 m2/ewe divided into 1·5 m2/ewe indoors and 1·5 m2/ewe outdoors). At the beginning of the experiment, and then every 2 months, the cell-mediated immune status of sheep was evaluated. One month after the beginning of the experiment, and 20 d later, the ewes were injected with chicken egg albumin (OVA) to assess their humoural immune responses. Starting from the beginning of the experiment and then monthly, behavioural activities of ewes were monitored using 15-min scans. After lamb weaning, milk yield from individual ewes was measured and milk composition analysed weekly. Housing conditions (low density reared ewes indoors v. low density reared ewes with free access to an outdoor area) affected cell-mediated response, which was higher in LDP than in LD ewes. Concentrations of anti-OVA IgG were mainly influenced by space allowance, with higher antibody titres in LD than in HD ewes throughout the experiment. Both housing conditions and space allowance affected sheep behavioural activities: a greater proportion of LDP ewes displayed standing and drinking behaviours than LD ewes, and a greater proportion of LD ewes was observed walking than HD ewes. Ewes allowed access to the outdoor area had a higher protein content and lower somatic cell count in their milk, whereas reduced space allowance led to a reduction in milk yield and an increase in somatic cell count of milk. Results indicate that both increased space allowance and availability of outdoor area can improve the welfare and production performance of the lactating ewe.

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Alexander, G., D. Stevens, and LR Bradley. "Fostering in sheep: experiences with the use of neatsfoot oil." Australian Journal of Experimental Agriculture 27, no. 6 (1987): 771. http://dx.doi.org/10.1071/ea9870771.

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This paper reports the results of 3 studies on variables associated with the use of neatsfoot oil for substitutive or additive fostering of lambs. In the first study, neatsfoot oil was applied at the rate of 60 mL/kg of liveweight to 3-day-old lambs from Merino and Border Leicester x Merino ewes, and the lambs were exchanged between pairs of ewes of the same breed 3.5, 7 or 24 h later. The proportion of ewes accepting the alien lamb from the other ewe of the pair within 17 h generally increased with the period from application to exchange. Crossbred ewes accepted the foster lambs more readily than did the Merinos. Acceptance rates with batches of neatsfoot oil produced by different methods were similar. We found no advantage in smearing the ewe's nose with neatsfoot oil at the time the oil was applied to the lamb. Additive fostering in 20 ewes that accepted the alien lambs and were left with their own lambs was 95% successful and appeared permanent. In the second study using similar methods, with lambs of 28 crossbred ewes anointed 24 h prior to exchange, no advantage was found in presenting the foster lamb to the ewe at night over presentation during the day. Most foster lambs were accepted within 12 h, and all ewes reaccepted their own lambs after a 13 h absence. The acceptance rate of foster lambs by the crossbred ewes ranged from 70 to 83%. In the third study, 27 Merino ewes whose lambs were anointed with neatsfoot oil 7-40 h after birth, were presented with freshly anointed foster lambs 24 h later. The rate of acceptance of the foster lambs within the next 24 h was 74%,but many ewes required prolonged restraint before reaccepting their own lambs after 5-26 h separation. The results show that most ewes can be induced to accept foster lambs 1-2 days post partum, if their offspring have been liberally coated with neatsfoot oil for 24 h, and then substituted with neatsfoot-treated foster lambs. For additive fostering, the ewes' offspring should be returned within a few hours.

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MAKOVICKY, PAVOL, MILAN MARGETÍN, PETER MAKOVICKÝ, MELINDA NAGY, and ANDREA PUSKÁS. "Study of mastitis in Slovak dairy sheep." Indian Journal of Animal Sciences 92, no. 4 (May 24, 2022): 517–19. http://dx.doi.org/10.56093/ijans.v92i4.124204.

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A trial was conducted on lambing ewes of Tsigai and Improved Valachian breeds in the 1st to the 3rd lactation in 2017 and in the 1st to 4th lactation in 2018. The lambing ewes were housed and managed under the same conditions over the experimental period. Milk samples for determination of SCC (Fossomatic 90, Foss Electric Co., Denmark) and contents of solids (% S), proteins (% P),fat (% F) and lactose (% L) (Multispec infrared analyzer) were taken by ewe milking in S period after intravenous application of oxytocin (5 i.u./ewe) and as part of milk recording at morning hand milking in M period. Milk samples were taken in such a way to be representative ones of the ewe’s whole milk yield. Daily milk production (MP) was also recorded in individual ewes on the day ofmilk sampling; in S period, it was calculated from a milk quantity produced within a 4 h interval and milked after

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Paganoni, B. L., M. B. Ferguson, G. A. Kearney, and A. N. Thompson. "Increasing weight gain during pregnancy results in similar increases in lamb birthweights and weaning weights in Merino and non-Merino ewes regardless of sire type." Animal Production Science 54, no. 6 (2014): 727. http://dx.doi.org/10.1071/an13263.

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Birthweight is the single largest determinant of survival in lambs and can be predicted from ewe liveweight at conception and liveweight changes during pregnancy. These prediction equations are known for Merino ewes, but it is unknown if they are applicable to non-Merino breeds. We tested the hypothesis that increasing conception weights of ewes will increase the birthweights, survival to weaning and weaning weights of their lambs, irrespective of ewe or sire breed, but that non-Merino lamb birthweights would be less responsive than Merino lamb birthweights, to changes in ewe liveweights during pregnancy. Ewe liveweight, lamb birth and weaning weight records from Merino sires mated to Merino ewes (MM), Border Leicester Merino (Maternal) sires mated to Merino ewes, Poll Dorset or Suffolk (Terminal) sires mated to Merino ewes (TM), and Terminal sires mated to Border Leicester Merino ewes (TMAT) were analysed from the 2007 to 2011 lambings of eight information nucleus flocks. Lamb birthweights increased by 0.032 ± 0.0012 kg from MM ewes and 0.024 ± 0.0026 kg from TMAT ewes with every 1-kg increase in conception weight (P < 0.001). Irrespective of breed, for every 1-kg increase in liveweight change during early and late pregnancy, lamb birthweights increased by 0.021 ± 0.0019 kg and 0.034 ± 0.0019 kg and weaning weights by 0.26 ± 0.013 kg and 0.09 ± 0.011 kg, respectively (P < 0.001). Survival to weaning of single, twin and triplet lambs was highest for lambs from TMAT ewes (89.3% ± 1.25, 84.6% ± 1.49 and 73.4% ± 2.35) and lowest for TM ewes (80.2% ± 1.89, 72.8% ± 2.09 and 57.4% ± 2.98; P < 0.001). Coefficients relating ewe liveweight change during pregnancy to lamb birthweights are similar for Merino and Maternal ewes, however conception weights of Maternal ewes are significantly heavier than Merino ewes when run together, and lamb birthweights from Maternal ewes are less responsive to ewe conception weights. The coefficients reported in this paper will enable development of optimum management guidelines for single-, twin- and triple-bearing Maternal ewes.

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Carson, A. F., L. W. McClinton, and R. W. J. Steent. "Effects of Texel or Rouge de l’Ouest genes in lowland ewes and rams on ewe prolificacy, lamb viability and weaned lamb output." Animal Science 68, no. 1 (February 1999): 69–78. http://dx.doi.org/10.1017/s1357729800050098.

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AbstractAn evaluation of the effects of the proportion of Texel or Rouge de l’Ouest (Rouge) genes in ewes (0, 0·5 or 1·0; the remainder being Greyface (Border Leicester × Scottish Blackface)) on prolificacy, lamb viability and lamb output was undertaken. A comparison of Texel and Rouge sires was carried out on Greyface, Texel and Rouge ewes. Prolificacy was higher in Greyface compared with Texel ewes (P = 0·06) but was lower in Greyface compared with Rouge ewes (P < 0·001). Prolificacy was similar in Greyface and Texel × Greyface ewes mated to Texel rams and in Greyface and Rouge × Greyface ewes mated to Rouge rams. The level of dystocia was similar in Greyface and Texel × Greyface ewes but significantly higher in Texel ewes (P < 0·001). The proportion of Rouge genes in the ewe had no effect on the level of dystocia. Litter weight of lambs at birth was significantly heavier in Greyface (P < 0·001) and Texel × Greyface (P < 0·01) ewes compared with Texel ewes. The proportion of Rouge genes in the ewe had no significant effect on litter weight. Lamb mortality (no. of lambs born dead and died birth to weaning) was significantly greater with Rouge ewes compared with the other ewe breed types (P < 0·001). The number of lambs which died from birth to weaning was lower with Texel × Greyface compared with Greyface ewes (P < 0·01). Expressed on a unit metabolic weight basis, Greyface ewes produced a significantly greater weight of lamb compared with Texel (P < 0·05) and Rouge ewes (P < 0·001). Texel × Greyface ewes produced a significantly greater weight of Texel-sired lamb compared with Greyface (P < 0·01) and Texel ewes (P < 0·001).Sire had a significant effect on a number of parameters. The number of productive ewes was significantly lower in ewes mated with Texel sires (P < 0·001). Lamb birth weights and pre-weaning growth rates were greater with Rouge sires (P < 0·05). Number of lambs weaned per ewe lambed was significantly greater with Texel sires (P < 0·01). Overall weight of weaned lamb produced per ewe was not significantly affected by sire breed.

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Clune, Thomas, Amy Lockwood, Serina Hancock, Andrew N. Thompson, Sue Beetson, Angus J. D. Campbell, Elsa Glanville, et al. "Abortion and Lamb Mortality between Pregnancy Scanning and Lamb Marking for Maiden Ewes in Southern Australia." Animals 12, no. 1 (December 21, 2021): 10. http://dx.doi.org/10.3390/ani12010010.

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The contribution of abortions to the overall mortality of lambs born to maiden (primiparous) ewes in Australia remains unclear. This cohort study aimed to quantify abortion and lamb mortality for ewe lambs and maiden Merino two-tooth ewes. Lamb mortality from pregnancy scanning to marking were determined for 19 ewe lamb and 11 Merino two-tooth ewe flocks across southern Australia. Average lamb mortality from scanning to marking was 35.8% (range 14.3–71.1%) for the ewe lambs and 29.4% (range 19.7–52.7%) for the two-tooth ewes. Mid-pregnancy abortion was detected in 5.7% of ewes (range 0–50%) in the ewe lamb flocks and 0.9% of ewes (range 0–4.4%) in the two-tooth ewe flocks. Mid-pregnancy abortion affecting ≥2% of ewes was observed in 6/19 ewe lamb flocks and 2/11 two-tooth ewe flocks. Lamb mortality from birth to marking represented the greatest contributor to foetal and lamb mortality after scanning, but mid-pregnancy abortion was an important contributor to lamb mortality in some ewe lamb flocks. Variability between the flocks indicates scope to improve the overall reproductive performance for maiden ewes by reducing foetal and lamb losses. Addressing mid-pregnancy abortion may improve the reproductive performance in some flocks.

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Dissertations / Theses on the topic "Ewes"

1

Smith, Keith Charles. "Reproductive abnormalities in ewes." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319129.

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Kleemann, D. O. "A study of factors affecting embryonic, fetal and lamb survival in high fecundity merino ewes." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phk638.pdf.

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Bibliography : leaves 120-133. Defines the sources of reproductive wastage in FecB FecÊ Booroola Merino x South Australian Merino ewes and examines factors associated with the survival of embryos, fetuses and lambs with the aim of improving net reproduction efficiency. Experiments were conducted to define the problem; to examine factors affecting embryonic and fetal loss; and, to investigate factors influencing wastage at lambing.

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Knights, Marlon. "Induction of fertile estrus during seasonal anestrus in ewes and fall born ewe lambs." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1938.

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Thesis (Ph. D.)--West Virginia University, 2001.
Title from document title page. Document formatted into pages; contains viii, 160 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 132-159).

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Van, Emon Megan. "Supplementing Metabolizable Protein to Ewes during Late Gestation: Effects on Ewe and Offspring Performance." Diss., North Dakota State University, 2013. https://hdl.handle.net/10365/26620.

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We hypothesized that MP intake at or above requirements during late gestation would improve dam and offspring performance. In year 1, ewes received one of three isocaloric dietary treatments during late gestation: 60MP1: 60% of MP requirements; 80MP1: 80% of MP requirements; and 100MP1: 100% of the MP requirements on a DM basis during the last 4 weeks of gestation for a ewe bearing twins. Similarly, in year 2, ewes received one of three isocaloric dietary treatments during late gestation: 60MP2: 60% of MP requirements; 100MP2: 100% of the MP requirements; and 140MP2: 140% of MP requirements. Dam performance was positively impacted by supplementing MP at or above requirements by maintaining dam BW and BCS. However, milk production was not significantly altered by maternal MP intake during late gestation. In both years, maternal MP intake did not affect offspring performance from birth to weaning. Metabolizable protein intake in isocaloric diets during late gestation had little influence male offspring feedlot performance or carcass characteristics. A reduction in maternal MP intake during late gestation reduced wether lamb N retention, but maternal MP supplementation above requirements did not enhance N retention of wether offspring. The data from the current study suggests that feeding 100% of MP requirements during late gestation may have greatest positive impacts on female reproductive performance. This analysis was strictly to determine the profitability of wether offspring alone during the feedlot phase based on their BW entering the feedlot and their performance. The wethers born to ewes fed 60% of MP requirements were the most profitable in both years, due to reduced BW entering the feedlot and increased HCW at slaughter. Overall, increasing maternal MP intake above requirements during late gestation did not improve offspring performance compared with offspring from ewes consuming reduced MP during late gestation. Therefore, feeding ewes 100% of MP requirements during late gestation may be the most beneficial to ensure positive dam and offspring performance.

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Kiyma, Zekeriya. "Effects of feed restriction and dietary oil supplementation on reproduction in sheep." Laramie, Wyo. : University of Wyoming, 2005. http://proquest.umi.com/pqdweb?did=888862061&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Clarke, Linda Sue. "Breed group effects on pregnancy rate and ewe performance in different seasons of the year." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53062.

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Thirty-one Dorset (D), 24 Finnish Landrace (F), 35 Barbados Blackbelly x Dorset (BD), 10 Dorset x Finn (F), 24 Finn x Dorset (FD) and 35 grade Rambouillet (R) ewes were exposed to rams in various seasons. Ewes were born in 1979 or 1980; no R ewes were born in 1980. Ewes were bred in April, 1980 (APR80); November, 1980 (NOV80); August, 1981 (AUG81); May, 1982 (MAY82); and April, 1983 (APR83). Ewes born in 1980 entered the study in NOV80. The analytical model used to describe ewe performance included effects of ewe birth year (EBY), breed/EBY, season/EBY, breed x season/EBY and ewe (random).
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Wurst, Aimee Kathryn. "Effects of ovulation of aged follicles, pregnancy diagnosis by ultrasonography, and treatments during lactation on reproduction in ewes." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5347.

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Thesis (Ph. D.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains viii, 113 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 88-113).

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Kerr, Nancy Jean. "Occurrence, etiology and management of ringwomb in ewes." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=964.

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Thesis (M.S.)--West Virginia University, 1999.
Title from document title page. Document formatted into pages; contains v, 46 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 37-45).

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Tadich, N. A. "Studies on immunisation of ewes and lambs." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370843.

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Ramadan, Ahmed A. "Immunophysiology of the uterus in cyclic ewes." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-155620/.

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Books on the topic "Ewes"

1

Arthursson, Elizabeth. Ewes and I. Anstey: F. A. Thrope, 1990.

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Sheep: Ewes, rams, and lambs. New York: PowerKids Press, 2011.

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Hanrahan, J. P. Breed evaluation: Performance of crossbred ewes. [Dublin]: Sheep Research Centre, Teagasc, 2001.

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Organization for Research on Eweland., ed. Outstanding Ewes of the 20th century. Accra: Woeli Pub. Services, 2002.

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Kumassah, Agbotadua. The migration saga of the Anlo-Ewes of Ghana. 2nd ed. [Keta, Ghana: s.n.], 2009.

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Kumassah, Agbotadua. The migration saga of the Anlo-Ewes of Ghana. 2nd ed. [Keta, Ghana: s.n.], 2005.

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Knights, Marlon. Reproductive management in the ewe flock by induction or synchronization of estrus. Morgantown, WV: West Virginia University, Davis College of Agricultural, Forestry and Consumer Sciences, WV Agriculture and Forestry Experiment Station, 2004.

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Lawson, Laura. Managing your ewe and her newborn lambs. Culpeper, Va: LDF Publications, 1993.

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Grane, Catrina H. Mc. A Comparison of Silage Types and Saved Forages for Pregnant Ewes. Dublin: University College Dublin, 1999.

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Flanagan, Sean. Reproductive management for early lambing ewes and rearing systems for their progeny. [Dublin]: Sheep Research Centre, Teagasc, 2001.

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Book chapters on the topic "Ewes"

1

Kalantzopoulos, G. C. "Cheeses From Ewes’ and Goats’ Milk." In Cheese: Chemistry, Physics and Microbiology, 507–53. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2648-3_16.

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Kalantzopoulos, G. C. "Cheeses From Ewes’ and Goats’ Milk." In Cheese: Chemistry, Physics and Microbiology, 507–53. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-2800-5_16.

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McNielly, A. S., J. M. Wallace, and D. T. Baird. "Induction of Ovulation in Anoestrous Ewes Using Gonadotrophins." In Endocrine Causes of Seasonal and Lactational Anestrus in Farm Animals, 66–75. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5026-9_8.

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Wilmut, I., C. J. Ashworth, and D. I. Sales. "The Influence of Progesterone Profile on Embryo Survival in Ewes." In Embryonic Mortality in Farm Animals, 135–41. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-5038-2_10.

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Cavalcanti, L. F. L., I. Borges, F. A. Souza, G. L. Macedo Júnior, and L. O. Tedeschi. "The development of the gravid uterus of Santa Inês ewes and ewe lambs under two nutritional planes." In Energy and protein metabolism and nutrition in sustainable animal production, 113–14. Wageningen: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-781-3_29.

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Najar, T., Aziza-Guesmi Boubaker, A. Rigueiro-Rodríguez, and M. R. Mosquera-Losada. "Study of Some Factors of Variation of intake on Course by Dairy Ewes." In Survival and Sustainability, 1501–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-95991-5_141.

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Fazio, E., M. Manera, S. Mignacca, P. Medica, and A. Ferlazzo. "Cortisol Changes in Pregnant and Post-Partum Ewes: Effects of Single or Twin Births." In Trends in Veterinary Sciences, 51–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36488-4_10.

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Mašek, T., Ž. Mikulec, H. Valpotić, and K. Mikulec. "Milk production of crossbred Istrian × East Friesian dairy ewes in Mediterranean region of Croatia." In Animal farming and environmental interactions in the Mediterranean region, 229–34. Wageningen: Wageningen Academic Publishers, 2012. http://dx.doi.org/10.3920/978-90-8686-741-7_28.

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Chay-Canul, A. J., J. C. Ku-Vera, A. J. Ayala-Burgos, M. L. Chizzotti, J. G. Magana-Monforte, and L. O. Tedeschi. "Effect of metabolizable energy intake on energy partitioning into muscle and fat in Pelibuey ewes." In Energy and protein metabolism and nutrition in sustainable animal production, 105–6. Wageningen: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-781-3_25.

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Al-Sabbagh, Tareq. "Colostral IgG As Affected By Nutritional Status for Border Leicester Merino Ewes Delivered in Kuwait." In Science, Policy and Politics of Modern Agricultural System, 239–48. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7957-0_16.

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Conference papers on the topic "Ewes"

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Mamedova, V. M. "Dairy productivity of different breeds ewes." In Current problems of modern animal husbandry. �� "��-��" - �� -�� , 2021. http://dx.doi.org/10.33694/978-966-1550-33-8-2021-0-0-94-96.

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Bøe, Knut Egil, and Stine Grønmo Kischel. "Space allowance and flooring in pregnant ewes." In 10th International Livestock Environment Symposium (ILES X). St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2018. http://dx.doi.org/10.13031/iles.18-089.

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Ivanyna, O. P. "Study of suitability the Ascanian karakul breed ewes to machine milking." In Current problems of modern animal husbandry. �� "��-��" - �� -�� , 2021. http://dx.doi.org/10.33694/978-966-1550-33-8-2021-0-0-76-77.

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Sánchez-Valencia, F., A. J. Chay-Canul, R. A. García-Herrera, M. Ptáček, A. Piñeiro-Vazquez, and F. Casanova-Lugo. "Relationship of body condition score and fat depots and in Pelibuey ewes." In 6th EAAP International Symposium on Energy and Protein Metabolism and Nutrition. The Netherlands: Wageningen Academic Publishers, 2019. http://dx.doi.org/10.3920/978-90-8686-891-9_157.

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A L Geng, Q Zang, G Chen, Z X Shi, and B M Li. "Behavioral Response of Pregnant Ewes to High Ambient Temperature in Loose Housing System." In Livestock Environment VIII, 31 August - 4 September 2008, Iguassu Falls, Brazil. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2008. http://dx.doi.org/10.13031/2013.25524.

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"Effects of eCG (Dosage and injection time) on reproductive performance in Kurdish ewes." In International Conference on Medicine, Public Health and Biological Sciences. CASRP Publishing Company, Ltd. Uk, 2016. http://dx.doi.org/10.18869/mphbs.2016.106.

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Machefert, C., C. Robert-Granié, P. Hassoun, S. Parisot, C. Allain, D. Portes, G. Lagriffoul, J. M. Astruc, and H. Larroque. "60. Validation and genetic analysis of a feed efficiency criterion in French Lacaune ewes." In World Congress on Genetics Applied to Livestock Production. The Netherlands: Wageningen Academic Publishers, 2022. http://dx.doi.org/10.3920/978-90-8686-940-4_60.

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Panadi, Mira, Khairiyah Mat, and Nor Dini Rusli. "Effects of diets containing varying metabolize energy on serum progesterone concentration of lactating Dorper ewes." In INTERNATIONAL CONFERENCE ON BIOENGINEERING AND TECHNOLOGY (IConBET2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0078790.

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Lobachova, I. V., and S. L. Drozd. "The influence of taking into account the ewes age to the sheep flocks reproduction indicators calculating." In Current problems of modern animal husbandry. �� "��-��" - �� -�� , 2021. http://dx.doi.org/10.33694/978-966-1550-33-8-2021-0-0-91-93.

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Rashid, M. R., M. A. Hanafy, W. M. Ghoneem, M. Jean Bart, and H. Archimède. "Response of lactating Blackbelly ewes to feed: Leucaena leucocephala leaves or alfalfa with/without green banana fruits." In 6th EAAP International Symposium on Energy and Protein Metabolism and Nutrition. The Netherlands: Wageningen Academic Publishers, 2019. http://dx.doi.org/10.3920/978-90-8686-891-9_57.

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Reports on the topic "Ewes"

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Kerr, Nancy J., and Robert A. Dailey. Occurrence, etiology and management of ringwomb in ewes. West Virginia University Agricultural Experiment Station, January 1999. http://dx.doi.org/10.33915/agnic.720.

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Spencer, Thomas E., Elisha Gootwine, Arieh Gertler, and Fuller W. Bazer. Placental lactogen enhances production efficiency in sheep. United States Department of Agriculture, December 2005. http://dx.doi.org/10.32747/2005.7586543.bard.

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The key objectives of this BARD project were to: (1) study long-term effects of immunization of prepubertal ewes against recombinant ovine placental lactogen (roPL) on subsequent birth weights of their lambs and their milk production; (2) optimize the anti-roPL immunization protocol using adjuvant preparations acceptable to producers and regulatory agencies; and (3) determine the physiological mechanism(s) whereby immunization against oPL increases fetal growth and development and mammogenesis. These objectives were based on key findings from a previous BARD project that: (a) immunization of ewes against roPL increased lamb birth weight and ewe milk production during lactation; (b) roPL and recombinant ovine growth hormone (roGH) increased the proliferation and differentiated function of endometrial glands that, in turn, would enhance uterine secretions necessary for fetal and placental growth; and (c) exogenous roPL and roGH stimulated mammogenesis and milk production during lactation. The BARD projects address central problems in sheep production, including reproductive failure due to embryonic/fetal mortality, low birth weight of lambs especially in prolific breeds, and reduced milk yields which affect neonatal survival. The sheep placenta secretes both lactogenic (oPL) and somatogenic (oGH) hormones. The receptors for those hormones are present in the fetus and placenta as well as maternal uterus, and mammary gland. Our research has focused on determining the biological role of these placental hormones in development and differentiation of the uterus during gestation and the mammary gland during pregnancy and lactation. Studies conducted in the current BARD project indicated that the effects of anti-roPL immunization were variable in ewes and that commercially available and widely acceptable adjuvant preparations were not effective to produce high anti-roPL titers in pre-pubertal ewes. In the non-prolific Rambouillet ewe in Texas and in the Awassi and the Assaf in Israel, anti-roPL immunization increased lamb birth weight; however, the magnitude of this effect and the inherent variability precluded our ability to determine the physiological mechanism of how the immunization increases fetal growth. Collectively, our findings suggest that anti-roPL immunization is not currently feasible as an easy and efficacious tool for the producer to increase flock reproductive and production efficiency. The variability in response of individual ewes to anti-roPL immunization likely includes modifying the recombinant hormone and the type of adjuvant used for the immunization. In particular, the oPL may need to be modified to ensure maximum antigenicity in a broad range of breed types. Nonetheless, the investigators continue to collaborate on identifying fundamental mechanisms that can be improved by genetics or management to enhance the efficiency of uteroplacental function and, in turn, fetal growth and development. High prolificacy is a desirable trait in intensive sheep production systems. One of the main limitations of using prolific breeds of sheep is that increased litter size is associated with low birth weights and increased mortality of lambs. Further, low birth weight is associated with an increased propensity for adult diseases and decreased production efficiency. Indeed, our recent studies find that the birth weights of lambs born in large litters can be improved by both genetics and management. Future cooperative research will continue to focus on reproductive efficiency of sheep that have broader implications for improving production efficiency in all types of ruminant livestock.

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Bazer, Fuller W., Arieh Gertler, and Elisha Gootwine. Role of Placental Lactogen in Sheep. United States Department of Agriculture, January 2001. http://dx.doi.org/10.32747/2001.7574339.bard.

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Central problems in sheep and dairy cattle production are reproductive failure due to embryonic/fetal mortality and low birth weights, especially in prolific breeds, and reduced milk yields which adversely affect neonatal survival and economy of production. The sheep placenta expresses lactogenic (ovine placental lactogen, oPL) and somatogenic (ovine placental growth hormone, oGH) hormones. Our research has focused on the biological roles of oPL and oGH in function of the uterine endometrium during gestation and the mammary gland during pregnancy and lactation. Major conclusions were that: ( 1 ) immunization of prepubertal ewes against oPL resulted in increased birth weights of their lambs and their milk production during lactation; (2) neither oPL nor oGH had an antiluteolytic effect on uterine endometrium to affect lifespan of the corpus luteum; (3) only sequential exposure of the progesterone stimulated uterus to oIFNt and oPL or oGH increased endometrial gland proliferation and secretory protein gene expression; (4) oPL signals through a homodimer of ovine prolactin receptor (PRL-R) and heterodimer of oPRL-R and growth hormone receptor (GH-R); (5) exogenous recombinant oPL and oGH stimulated mammogenesis and milk yield during lactation; and (6) mutation of oPL and oGH was used to define specific biological effects and a rational basis for design of a specific receptor agonists or antagonists. This project was very productive in elucidating basic biological effects of oPL and oGH on intracellular signal transduction pathways, uterine development and secretory function, as well as mammogenesis and lactogenesis. We determined that immunization of prepubertal ewes against roPL increased birth weights of their lambs, especially those born as twins and triplets, as well as enhanced lactational performance. These studies significantly extended our knowledge of uterine and fetal-placental physiology and provided a foundation for new strategies to enhance reproductive and lactation efficiency. Based on these results, the major achievements were: 1) creation of a practical and cost effective management tool for producers to increase reproductive performance, neonatal survival, and milk yield of ewes in commercial flocks; and 2) define, for the first time, biological effects of oPL on endometrial functions and gene expression by uterine gland epithelium.

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Gootwine, Elisha, David Thomas, Ruth Braw-Tal, Amir Bor, and P. J. Dziuk. Improvement of Prolificacy of Israeli and U.S. Sheep Breeds through Inclusion of the F Gene of the Booroola Merino-Stage II. United States Department of Agriculture, May 1995. http://dx.doi.org/10.32747/1995.7604931.bard.

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The purposes of this project were: 1) to introduce the FecB gene to the Awassi and Assaf breeds in Israel and the Rambouillet breed in the U.S.A. aiming in the long run to establish Awassi, Assaf and Rambouillet nucclei breeding flocks homozygous for the F gene in which the contribution of the Booroola Merino genetic background will be less than 10%; (In the U.S., Booroola crosses with Suffolk and Targhee were also studied. 2) to evaluate the effect of the FecB gene and different proportions of Booroola Merino genetic background on lamb survival, growth, milk production and wool production in Booroola crosses with the native breeds; 3) to reveal the specific effect of the FecB gene on ovarian development, follicle stimulating hormone (FSH) and inhibin secretion in prepubertal ewe lambs and in adult ewes in order to define physiological criteria for distinguishing carriers of the FecB allele from non-carriers and 4) to identify genetic markers linked to the FecB gene to assist in selection of genotypes within the Booroola crosses. Introgression of the Booroola gene reached the stage of the third backcross in the Awassi, Assaf and the Rambouillet crosses. In all cases the Booroola crosses were superior in prolificacy. However, they were inferior in comparison to the local breeds in production due to Booroola Merino genes other than the FecB. It is expected that the beneficial economic contribution of the Booroola gene will increase along with the upgrading to the local breeds. FSH plasma levels and induced ovulation rate of 5 month old FecB carriers among the crossbreeds. The OarAE101 marker can assist in detecting FecB carriers among Booroola-Awassi crosses. However, this marker is informative only in some of the families.

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McEachin, Natasha. Graduate Level Credit for Resident EWS Students. Fort Belvoir, VA: Defense Technical Information Center, February 2009. http://dx.doi.org/10.21236/ada508034.

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Dekel, Nava, Donald Dierschke, Yitzhak Koch, and Uzi Hanoch. Induction of Increased Conception Rate and Litter Size by Hormonal Treatment of the Ewe. United States Department of Agriculture, December 1992. http://dx.doi.org/10.32747/1992.7604279.bard.

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Kleinerman, Eugenie S. Hypoxia induces lineage modulation of Ewing’s sarcoma tumor cells into EWS-FLI-1 + vascular pericytes. Science Repository, March 2019. http://dx.doi.org/10.31487/j.cor.2019.01.006.

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Lamontagne, M. Développement d'un système d'alerte précoce pour les tremblements de terre du Québec. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328951.

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Several regions of the world already have or are in the process of developing an early warning system (EWS) for earthquakes. As is well known, earthquakes cannot be predicted in the short term. However, an EWS is based on the principle that when a strong earthquake occurs, the initial seismic waves detected by seismographs near the epicentre can be quickly analysed. Once analyzed automatically, an alarm signal can be sent to more distant areas before damaging seismic waves arrive. This alert can then be used to take action before the seismic waves arrive (such as stopping industrial activities for example). In Canada, these technologies are being developed for the Pacific region and Eastern Canada. Quebec is particularly interesting because earthquakes of magnitude 5 are felt at great distances, which increases the warning time when an earthquake occurs. Natural Resources Canada (NRCan) will lead this initiative, in partnership with provincial collaborators. The private sector will also be involved through the development of software and applications. NRCan is therefore reaching out to potential partners in such an earthquake warning system.

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Strong, Emily, Samaneh Azarpajouh, Benjamin Drescher, Anna Johnson, and Daniel G. Morrical. ANS 490-A: Ewe Lamb’sTemperament and Effects on Maze Entry, Exit Order and Coping Styles When Exposed to Novel Stimulus. Ames (Iowa): Iowa State University, January 2017. http://dx.doi.org/10.31274/ans_air-180814-394.

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Valencia, Oscar, Juan José Díaz, and Diego A. Parra. Assessing Macro-Fiscal Risk for Latin American and Caribbean Countries. Inter-American Development Bank, November 2022. http://dx.doi.org/10.18235/0004530.

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This paper provides a comprehensive early warning system (EWS) that balances the classical signaling approach with the best-realized machine learning (ML) model for predicting fiscal stress episodes. Using accumulated local effects (ALE), we compute a set of thresholds for the most informative variables that drive the correlation between predictors. In addition, to evaluate the main country risks, we propose a leading fiscal risk indicator, highlighting macro, fiscal and institutional attributes. Estimates from different models suggest significant heterogeneity among the most critical variables in determining fiscal risk across countries. While macro variables have higher relevance for advanced countries, fiscal variables were more significant for Latin American and Caribbean (LAC) and emerging economies. These results are consistent under different liquidity-solvency metrics and have deepened since the global financial crisis.

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