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Littérature scientifique sur le sujet « Sheep Fertility »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 1 février 2022

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Articles de revues sur le sujet "Sheep Fertility"

Raoof, Salim Omar. « Role of Sex Chromatin on performance in the Arabi sheep ». Iraqi Journal of Veterinary Medicine 41, n^o 1 (5 juin 2017) : 145–50. http://dx.doi.org/10.30539/iraqijvm.v41i1.97.

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This study was conducted on 122 Arabi sheep belonged to private flock in Erbil plain Kurdistan region- Iraq, from July/ 2014 to August/ 2015 for studying the role of sex chromatin on daily milk production, total milk production, lactation period, fertility rate, prolificacy, birth weight and fertilizes estrous sequences. The repeatability for the studied traits were estimated. The ratio of sex chromatin shapes drum stick, sessile nodule, tear drop and small club were 23.37%, 60.22%, 8.54% and 7.87% respectively.The overall means of daily milk production, total milk production, lactation period, birth weight, fertilize estrous sequences, fertility rate, and Prolificacy were 814.65 g 81.49 kg 103.53 day, 78.10%, 1.60, 3.84 kg and 1.50 respectively. Sex chromatin shapes had significant (P<0.05) effect on all traits studied. The results revealed that the estimation of the Repeatability coefficient for daily milk production was 0.42. It was concluded from this study that production traits (milk production and birth weight) and reproduction (fertility rate, prolificacy and fertilize estrous sequences) performance of Arabi sheep were significantly affected by the shapes and percentage of sex chromatin distribution and measurements. The sex chromatin shapes could be used as a tool for early selection of the elite individuals.

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Petrovic, Milan, V. Caro-Petrovic, D. Ruzic-Muslic, N. Maksimovic, Z. Ilic, B. Milosevic et J. Stojkovic. « Some important factors affecting fertility in sheep ». Biotehnologija u stocarstvu 28, n^o 3 (2012) : 517–28. http://dx.doi.org/10.2298/bah1203517p.

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Efficiency of sheep production is conditioned by fertility. According to some authors number of offspring obtained per lambing is more important than gain of weight. Genetic relationships involving reproductive traits were seldom studied. Reproductive traits have low heritabilities, a discrete phenotypic expression, and are expressed only in sexually mature ewes leading to low selection intensities and long generation intervals. Documentation of realized selection response is also often complicated by the low heritabilities of fertility traits. Existence of a major gene affecting prolificacy had been suggested and at that time there were many sceptics who strongly doubted that a trait as complex as reproduction could be profoundly influenced by a single gene. Major genes affecting prolificacy in sheep was founded. A mutation in the bone morphogenetic protein 15 gene (BMP15, also known as GDF9B) responsible for high prolificacy in Inverdale sheep had been discovered and evidence of segregating major genes was being reported from flocks around the world. Development of gene mapping techniques, and locating alleles that are responsible for the fertility of sheep began a new chapter in predicting and controlling the fertility of sheep. The beneficial effects of nutrition on reproduction in sheep are well known. This procedure is known as flushing. The effect of Body Condition Score (BCS), before mating, during mating and after mating period, on reproductive efficiency of different breeds of sheep in the different rearing systems were studied. The farm manager has the ability to control or at least to manipulate the factors that have an impact on fertility.

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PAPADOPOULOS (Σ. ΠΑΠΑΔΟΠΟΥΛΟΣ), S., E. THEODOSIADOU (Α. ΘΕΟΔΟΣΙΑΔΟΥ), D. KANTAS (Δ. ΚΑΝΤΑΣ) et E. VALASI (Ε. ΒΑΛΑΣΗ). « The application of in vitro fertilization techniques for the evaluation of ram fertility ». Journal of the Hellenic Veterinary Medical Society 66, n^o 2 (31 janvier 2018) : 63. http://dx.doi.org/10.12681/jhvms.15588.

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The prediction of field fertility of a given ram by using in vitro tests would be of great importance for the reproductive management in sheep flocks. There are many in vitro procedures available for evaluating semen quality and fertilizing ability, and the method chosen depends on the objective of evaluating the sperm and the available resources. The in vitro evaluation of semen fertilizing ability was firstly developed for the artificial insemination (AI) purposes and secondly for the application of in vitro fertilization (IVF) technique. The IVF techniques allow the assessment of fertility in terms of ability to penetrate and fertilize in vitro mature oocytes and ultimately to yield component embryos following IVF and culture. In this review are briefly presented in vitro studies performed in an attempt to establish an accurate laboratory test for the evaluation and, even more, the prediction of field fertility in sheep.

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Vlasenko, S., O. Zhulinska et O. Yeroshenko. « Clinical and laboratory prognostic indicators for fertility in sheep ». Naukovij vìsnik veterinarnoï medicini, n^o 1(149) (30 mai 2019) : 6–14. http://dx.doi.org/10.33245/2310-4902-2019-149-1-6-14.

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With the use of technology of artificial insemination in sheep farms are not yet defined criteria for assessing the full value of the preparation of females for insemination, and hence – the possibility of prediction and correction of their fertilization, which prevents the rational use of cryopreserved semen and ensuring the maximum reception of the offspring. We have proved the prognostic importance of fertilization of the morphofunctional state of the vulva and the vagina and the quality of mucus in sheep breeds during estrus. The material of the study was 327 sheep of ascanian breeding, which during the sexual intercourse before insemination examined the vulva, vagina and evaluated the estrus slime (number, color, consistency, presence of impurities, elasticity, electrical resistance, type of crystallization, protein content). The results of ultrasound diagnosis of pregnancy were determined by the fertility of sheep with different integral compositions of clinical and laboratory parameters. It has been established that in sheep, in which fertility in the first sexual cycle reached 65.1%, most often found a pink, moderately edematous vulva with clear mucus. In females with pale mucous membrane and insignificant amount of mucus, the effectiveness of inseminates declined to 53.3-58.0%. In a significant amount of estral mucus, the proportion of infertile animals increased twofold. At the same time, the selection of liquid, but cloudy, or thick mucus is a sign of an unfavorable prognosis, in which fertility decreases by 1.8-2.1 times (p <0.001). Dense, white, paste-like isolates were observed in a small number of sheep, mostly bright at the beginning of the anestral season. Low fertility in the first sexual hunting (35.5%) and a high multiplicity of repeated inseminations (29.0%) indicate that sheep with thick estral slime are only beginning to enter the sexual season, and this quality of secrecy indicates an inadequate estrogenization of the body. It was also found that in the infertile sheep during sexual hunting, the protein content of cervical mucus was 4.8 times higher, and the elasticity of mucus was reduced by 2.9 times. The most prevalent was the prognosis of average fertilization (53.3-58.0%), which was recorded in 62.9% of experimental sheep. The prognosis of high fertilization, which resulted in 62.5-65.1% of oseminins, was found in 27.8% of females. At the same time, the number of females with a fertility forecast at 40% was only 3.1%, and the prevalence of an unfavorable prognosis, in which fertility was the smallest (30.0-35.5%), reached 6.2%. Key words: sheep, askanian breeding, estrus, fertility prognosis, estral mucus, vulva, vagina, artificial insemination.

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Scaramuzzi, RJ, JA Downing, BK Campbell et Y. Cognie. « Control of Fertility and Fecundity of Sheep by Means of Hormonal Manipulation ». Australian Journal of Biological Sciences 41, n^o 1 (1988) : 37. http://dx.doi.org/10.1071/bi9880037.

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The results of four experiments are presented in summary form. The data are considered in relationship to the improvement of the fecundity and fertility of the Australian ewe breeding flock. In the first, three commonly used methods of oestrous synchronization were examined and showed differences that are attributed to the different patterns of hormonal changes associated with the methods demonstrated. The second experiment looked at the use of active immunization against testosterone and concluded that this method can improve fecundity but not fertility. The third experiment, a group of five trials, studied the use of progestagen sponges and PMSG in anoestrous ewes as a means of inducing normal fertility. The extensive data produced in this experiment allowed the relationships between ovulation rate and fertility and between fertility and prolificacy (fecundity) to be examined. Fertility appeared greatest when the mean flock ovulation rate was about 2�5. At this ovulation rate prolificacy was also improved and a high proportion of twins were produced. We concluded that high fertility and low prolificacy (i.e. of 1�00) are an unlikely combination. In the final experiment the effect of post-mating hormonal supplementation on fertility was examined and a number of earlier reports were confirmed by showing that fertility can be improved with supplementary progesterone between days 10 and 25 post-mating. The effect appears to be modified by hormonal and nutritional factors.

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Maxwell, W. M. C., et H. R. Wilson. « Fertility of fresh, chilled and frozen merino sheep embryos ». Theriogenology 41, n^o 1 (janvier 1994) : 251. http://dx.doi.org/10.1016/s0093-691x(05)80161-x.

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Evans, A. C. O. « Ovarian follicle growth and consequences for fertility in sheep ». Animal Reproduction Science 78, n^o 3-4 (octobre 2003) : 289–306. http://dx.doi.org/10.1016/s0378-4320(03)00096-4.

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David, Ingrid, Philippa Kohnke, Gilles Lagriffoul, Olivier Praud, Franck Plouarboué, Pierre Degond et Xavier Druart. « Mass sperm motility is associated with fertility in sheep ». Animal Reproduction Science 161 (octobre 2015) : 75–81. http://dx.doi.org/10.1016/j.anireprosci.2015.08.006.

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Boland, M. P., et T. F. Crosby. « Fecundin : An immunological approach to enhance fertility in sheep ». Animal Reproduction Science 33, n^o 1-4 (octobre 1993) : 143–58. http://dx.doi.org/10.1016/0378-4320(93)90112-5.

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Bortoletti, G., F. Gabriele, V. Seu et C. Palmas. « Epidemiology of hydatid disease in Sardinia : a study of fertility of cysts in sheep ». Journal of Helminthology 64, n^o 3 (septembre 1990) : 212–16. http://dx.doi.org/10.1017/s0022149x00012189.

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ABSTRACTHydatidosis, caused by Echinococcus granulosus, is a cyclozoonotic disease of economic significance in Sardinia. The life-cycle involves stray and sheep dogs as definitive hosts and sheep, pigs, goats and cattle as intermediate hosts. The most important intermediate host is sheep, due to home slaughtering with ready access of the viscera to dogs. This survey was undertaken in 1987 to ascertain the epidemiological significance of sheep in maintaining the life-cycle. A total of 700 (91·3%) of 767 sheep harboured hydatid cysts. The frequency distribution of the number of hydatid cysts was over-dispersed. Of 497 infected sheep, 7·6% had fertile cysts, 75·7% sterile cysts and 16·7% fertile + sterile cysts.

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Thèses sur le sujet "Sheep Fertility"

Quintana, Casares Pablo Ignacio. « Studies on the relationship between characteristics of ram semen and fertility ». Title page, contents and summary only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phq7.pdf.

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Includes bibliographical references (leaves 274-316) Examines several aspects of male reproduction in the sheep, and how these are related to fertility in the female when semen is introduced by natural mating or artificial insemination.

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Singh, Inderjeet. « Embryonic survival in adrenal hyperactivity in sheep ». Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386839.

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Findlater, Richard Cameron Fraser. « Intrauterine insemination to improve fertility with frozen semen in sheep ». Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328811.

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Al-Shorepy, Salih Abdu. « Selection to improve spring fertility in a crossbred sheep population ». Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40136.

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Reproductive and productive performance of a composite sheep population, containing 50% Dorset, 25% Rambouillet and 25% Finn sheep breeding and under selection for ability to lamb in the fall, was evaluated. Traits considered were spring fertility, faIl litter size, live weights at birth, weaning, and at about 90 and 120 d of age, and scrotal circumference at weaning and at about 90 and 120 d of age. Fertility was defined as 1 or 0 depending upon whether a ewe lambed or failed to lamb, respectively, in fall. Litter size was defined as the number of lambs born per ewe lambing. A total of 1,102 exposures were used. Fertility averaged .59 for adult ewes (3 years and older), .45 for second-lambing ewes and .11 for yearling ewes (12 months old). Mean litter size averaged 1.89 across seasons and ages. Scrotal circumferences (SC) and body weights (WT) were measured at means of65, 96 and 128 d. Data were collected on 1878 lambs over 5 years; 63 sires and 420 dams were represented. Genetic parameters were estimated by restricted maximum likelihood (REML) using various animal models. Heritability estimates for spring fertility ranged from .07 to .11. Litter size heritability was .05 for fall lambing and .10 for all lambings. Heritability estimates for weights from birth to 120 d ranged from .04 to . 19. Heritabilities for SC ranged from .02 to .25. Estimated genetic correlations among weights were large, and ranged from. 77 to unity. The genetic correlations of litter size with birth weight (BWT), 90-d weight (90WT) and 90-d scrotal circumference (90SC) were .17, .33 and .36, respectively. Genetic correlations of spring fertility with BWT, 90WT and 90SC were .22, -.31 and .29, respectively. Mixed model methodology was applied to estimate genetic trends for fertility, litter size, BWT, weaning weight (WWT), 90WT and 90SC resulting from selection for fall lambing. Positive genetic gains in both spring fertility and fall litter size were observed. Rate of increase was higher for fertility than litter size, which was due to direct selection for fertility. Selection for spring fertility did not cause significant correlated changes in BWT, WWT, 90WT or 90SC. Thus, no genetic antagonisms resulted from the selection for fall lambing.
Ph. D.

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Auclair, Dyane. « Pubertal development in the merino ram lambs and immunization against oestrogens ». Title page, contents and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09pha898.pdf.

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Bibliography: leaves 281-316. Presents investigations on pubertal development in South Australian merino ram lambs and examines the effect of active and passive immunizations against oestradiol-17ℓ or oestrone on testicular maturation.

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Jordan, Katherine Mead. « Characterization of seasonal reproduction in Virginia Tech Selection Line, St. Croix, and Suffolk ewes ». Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28663.

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This dissertation research contained three studies. The first two studies were conducted to investigate the ability of ewes to rebreed while lactating during seasonal anestrus. Breeds studied included the Virginia Tech Out-of-season (OOS) Line, which is a wool line genetically selected to lamb in the fall, and the St. Croix, a hair breed of tropical origin thought to be lowly seasonal. When January-lambing ewes were exposed to rams while lactating in April, significantly more OOS than St. Croix ewes were marked by rams in the first 21 d and total 39 d of ram exposure (58.3 vs. 8.7%, P = 0.0003 and 95.8 vs. 43.5%, P < 0.0001). Percentages of ewes diagnosed pregnant (53.2%) and percentages of ewes lambing (41.3%) were not different between breeds. When March-lambing OOS ewes were exposed to rams while lactating in May, 52.9% of ewes were marked though only 20% of ewes exposed to rams gave birth to viable lambs. Both OOS and St. Croix ewes appear to be well suited to accelerated production systems involving 7 to 8 mo lambing intervals. However, reduction of lambing intervals to 6 to 7 mo appeared to have detrimental effects on fetal survival in OOS ewes. In a third study, alterations in endocrine profiles associated with differing degrees of hypothalamic sensitivity to estradiol-negative feedback and changing daylength in OOS, St. Croix, and Suffolk ewes in the absence of rams were investigated for 1 yr. The results show for the first time that based on progesterone profiles from intact ewes, St. Croix ewes do not have shorter anestrous periods than ewes of wool breeds, as previously thought. Based on luteinizing hormone profiles from ovariectomized ewes treated with estradiol implants, the duration of luteinizing hormone inhibition was shorter in OOS than Suffolk ewes (68 vs. 170.2 d, P = 0.02), but was not different from that found in St. Croix ewes (124.8 d). Specific roles for thyroxine and prolactin in timing the breeding season could not be assigned. This study was the first known use of the ovariectomized, estradiol-implanted ewe model to compare degree of reproductive seasonality in different breeds.
Ph. D.

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Ahmad, Nazim. « A study of the control of luteal function in the sheep and goat ». Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316651.

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Vanimisetti, Hima Bindu. « Genetic evaluation of ewe productivity and its component traits in Katahdin and Polypay sheep ». Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29760.

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The objectives of this dissertation were to evaluate genetic influences on ewe productivity, its growth and reproductive components, and measures indicative of accelerated lambing performance. Genetic parameters were estimated for total weight of litter weaned per ewe lambing (TW) and its components, number of lambs born (NB), number of lambs weaned (NW) and average weight of lambs weaned (AW), measured as traits of the ewe, and lamb survival (LS) and weaning weight (WW), measured as traits of the lamb, in Katahdin sheep. Heritabilities of TW, NB, NW, and AW, were 0.12, 0.12, 0.09, and 0.13, respectively. Heritability of WW was 0.15 to 0.20. Genetic effects on LS were negligible. Genetic correlation of TW with NB, NW, and AW averaged 0.30, 0.90, and 0.74, respectively, those of NB with NW and AW averaged 0.72 and 0.01, respectively, and that between NW and AW averaged 0.50. Direct genetic effects on WW were independent of NB and NW, but correlation between maternal genetic effects on WW and animal genetic effects on NW averaged 0.35. Ewe fertility, NB, LS, and WW were modeled using stochastic simulation and used to derive NW, AW, and TW to test alternative predictors of genetic merit for TW. A random 8% of WW observations were set to missing values and AW and TW were recalculated to evaluate the effects of data reporting inconsistencies on efficacy of different prediction strategies. Four alternative predictors of estimated breeding values (EBV) for TW involved direct univariate prediction (TW1), an index of EBV for NW and AW (TW2), indirect prediction using data for NW and AW and genetic correlations among NW, AW and TW (TW3), and indirect prediction augmenting TW3 with data and genetic correlations involving NB (TW4). To validate efficacy of predictors, daughter data sets were generated from the original ewes and their realized TW were regressed on alternative predictors. Regression coefficients from TW1, TW3, and TW4 were close to the expected value of 0.50 whereas those from TW2 were less than 0.50. Model Rsquare statistics were similar among predictors when there were no missing WW data but regressions involving TW1 had lowest model R-square when some WW data was missing. Ewe lamb fertility (ELF), ages at first, second, and third lambings (AGE1 to AGE3), first and second lambing intervals (INT1 and INT2), and number of lambings by 38 mo of age (LAMB3) were evaluated for an accelerated lambing Polypay flock. Relationships among these traits and NB and WW were estimated. Heritability of ELF, AGE1, AGE2, AGE3, INT1, INT2, and LAMB3 were 0.14, 0.39, 0.28, 0.36, 0.00, 0.09, and 0.27, respectively. Heritability of AGE2 and AGE3 were negligible after accounting for variation in AGE1. Genetic correlations of ELF with AGE1 and AGE2 were -0.89, -0.91, respectively, and that with LAMB3 was 0.89. Genetic correlations of LAMB3 with AGE1 and AGE2 were -0.49 and -1.00, respectively. Genetic correlations of ELF and LAMB3 with direct genetic effects on WW were close to -0.70, but correlations with maternal genetic effects on WW were 0.88 and 0.58, respectively. Prolificacy was independent of ELF and LAMB3.
Ph. D.

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Kelany, Khaled Elaraby. « Can Hematocrit Levels at Estrus in Dairy Cows and Sheep Be an Indicator for Pregnancy Success ? » Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/31604.

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Despite the major reproductive advances in the livestock industry, prenatal embryonic loss is still one of the major issues that causes substantial economic loss. While there are many tests available to determine pregnancy soon after maternal recognition of pregnancy, most of the prenatal losses are undetectable because it occurs before then. Based on previous research we hypothesized that increased plasma volume around the time of estrus will increase the survivability of the embryo at early stages of gestation. However, our findings indicate that hematocrit levels are not a consistent measurement in determining successful pregnancies.

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Nugent, Russell A. III. « Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes ». Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44057.

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The present studies were conducted to check the effects of acute ram introduction into a flock of anestrus ewes in Virginia. Ewes were bled via jugular venipuncture twice weekly and serum samples were radioimmunoassayed for progesterone (P4) content as an indicator of estrous activity. All rams were fitted with crayon equipped marking harnesses for use as an indicator of mating behavior in ewes. The first study tested the effects of introduction of vasectomized rams into a flock: of' 50 Dorset (D) and 50 Hampshire (H) purebred ewes in either May or June. More D ewes ovulated (96% vs 72% for H ewes) and mated (80% vs 20% for H ewes) in May. Of ewes which mated in May 65% D but no H ewes continued to cycle in June after removal of rams. Of ewes exposed to rams in June no difference among breeds was observed in percentage of ewes ovulating but more D ewes (72%) mated than H ewes (44%). Twenty-four percent of D but no H ewes cycled continuously throughout the 68 d or the study. Lambing date significantly affected mating behavior in H but not D ewes. The second study tested the effects of ram breed on incidence of mating and subsequent lambing in Rambouillet x Q Suffollk ewes In June and July of 1984 and 1985. Ewes were Q pre-exposed to either confined Suffolk (S) or Dorset (D) Q yearling rams or no (N) ram for 2 wk prior to breeding by Q either S or D rams. Lambing date was significantly affected by breeding treatment in 1984 and by pre-exposure treatment in 1985. Sixty-three percent of the ewes lambed in 1984 while 65% lambed in 1985.
Master of Science

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Livres sur le sujet "Sheep Fertility"

Sharipov, I. K. Kariotip domashnikh i dikikh ovet͡s︡. Alma-Ata : Izd-vo "Nauka" Kazakhskoĭ SSR, 1989.

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Byrne, Garret P. Effects of freezing rate of ram semen on subsequent fertility in vivo and in vitro. Dublin : University College Dublin, 1998.

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West, Kathryn S. Effects of differential ewe body condition at mating and early post-mating nutrition on embryo survival. 1990.

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Chapitres de livres sur le sujet "Sheep Fertility"

Hoskinson, R. M., R. J. Scaramuzzi, B. K. Campbell, J. A. Downing, R. J. Welch et B. E. Harrison. « Effects of Antibodies to Steroid Hormones on Reproductive Events of Sheep and Cattle ». Dans Immunological Approaches to Contraception and Promotion of Fertility, 351–66. Boston, MA : Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-5140-5_38.

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« OVULATION AND ESTRUS IN SHEEP AND GOATS ». Dans Problem of Fertility, 11–48. Princeton University Press, 2017. http://dx.doi.org/10.1515/9781400886876-003.

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Santolaria, Pilar, Inmaculada Palacin et Jesus Yaniz. « Management Factors Affecting Fertility in Sheep ». Dans Artificial Insemination in Farm Animals. InTech, 2011. http://dx.doi.org/10.5772/18013.

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WINFIELD, C. G., et L. P. CAHILL. « MATING COMPETENCY OF RAMS AND FLOCK FERTILITY ». Dans Reproductive and Developmental Behaviour in Sheep, 35–37. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-444-42444-0.50009-7.

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Hochereau-de Reviers, M. T., M. R. Blanc, G. Colas et J. Pelletier. « Parameters of male fertility and their genetic variation in sheep ». Dans Genetics of Reproduction in Sheep, 301–14. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-407-00302-6.50032-5.

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Narayan, Edward, Gregory Sawyer, Natalie Hoskins et Greg Curren. « Reproductive Rates of Merino Ewes and Offspring Quality under AI Program ». Dans Sheep Farming [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99617.

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Reproductive wastage is a major economic burden in sheep production globally, especially within Australia as livestock production systems face increased pressure from climatic variability (e.g. prolonged droughts or flooding). Sheep are sensitive to acute changes in their environment such as heat stress, which if not adequately monitored will result in significant production losses such as reproductive failure, increased parasite and worm burden, morbidity and mortality risks. Through basic and applied research in the areas of stress and reproductive physiology our team has made significant advancements in the understanding of sheep behaviour and physiological responses to acute and chronic stressors. Using minimally invasive hormone monitoring technology in combination with field based assessment of sheep health and productivity traits, our team has delivered new knowledge on how sheep react to acute environmental stress and how it impacts on sheep reproduction. In this chapter, we evaluated the fertility rates and embryo quality of Merino ewes under AI breeding program. We discuss factors such as heat stress that can impact on ewe and offspring quality.

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FOWLER, D. G., et C. M. LANGFORD. « THE PREDICTION OF FERTILITY AND FECUNDITY FROM THE MATING ACTIVITY OF EWES ». Dans Reproductive and Developmental Behaviour in Sheep, 13–17. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-444-42444-0.50006-1.

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Ponzoni, R. W., S. K. Walker, J. R. W. Walkley et M. R. Fleet. « The productivity of Bungaree, Booroola × Bungaree and Trangie Fertility × Bungaree Merino ewes in South Australia ». Dans Genetics of Reproduction in Sheep, 127–37. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-407-00302-6.50017-9.

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Price, Max D. « Urban Swine and Ritual Pigs in the Bronze Age ». Dans Evolution of a Taboo, 62–91. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780197543276.003.0005.

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The elite-run institutions (temples and palaces) of Bronze Age societies sought to maximize the production of storable, taxable, and tradable agricultural commodities—especially grain and wool. This brought the secondary products revolution to full fruition and solidified the transformation of cattle, sheep, and goats into animals that embodied wealth. Later this privilege extended to equids for their role in warfare. While institutional forms of wealth excluded pigs, urbanism offered a new and ideal ecological niche for pig husbandry. Pigs became especially important among the urban lower classes, perhaps as a type of “informal economy.” Yet in regions without large cities or extant traditions of eating pork, pig husbandry failed to thrive. The Levant, in particular, saw the gradual erosion of pig husbandry in favor of wealth-bearing livestock husbandry. At the same time, pigs’ ritual roles began to shift. Whereas once the sacrifice of swine was thought to ensure fertility, communication with the dead, and the absolution of sin, by the Late Bronze Age pigs connoted impurity.

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Munodawafa, Adelaide. « The Significance of Soil Erosion on Soil Fertility Under Different Tillage Systems and Granitic Sandy Soils in Semi-Arid Zimbabwe : A Comparison of Nutrient Losses Due to Sheet Erosion, Leaching and Plant Uptake ». Dans Soil Erosion Issues in Agriculture. InTech, 2011. http://dx.doi.org/10.5772/23992.

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Actes de conférences sur le sujet "Sheep Fertility"

Trukhachev, Vladimir, Sergei Oliinyk, Tatyana Lesnyak et Nikolay Zlyidnev. « Application of unmanned aerial vehicles for remote estimation of pasture fertility while growing Dzhalginsky Merino sheep ». Dans 18th International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, 2019. http://dx.doi.org/10.22616/erdev2019.18.n465.

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