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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, no. 1 (June 5, 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

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Petrovic, Milan, V. Caro-Petrovic, D. Ruzic-Muslic, N. Maksimovic, Z. Ilic, B. Milosevic, and J. Stojkovic. "Some important factors affecting fertility in sheep." Biotehnologija u stocarstvu 28, no. 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 h

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PAPADOPOULOS (Σ. ΠΑΠΑΔΟΠΟΥΛΟΣ), S., E. THEODOSIADOU (Α. ΘΕΟΔΟΣΙΑΔΟΥ), D. KANTAS (Δ. ΚΑΝΤΑΣ), and 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, no. 2 (January 31, 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

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Vlasenko, S., O. Zhulinska, and O. Yeroshenko. "Clinical and laboratory prognostic indicators for fertility in sheep." Naukovij vìsnik veterinarnoï medicini, no. 1(149) (May 30, 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, wh

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Scaramuzzi, RJ, JA Downing, BK Campbell, and Y. Cognie. "Control of Fertility and Fecundity of Sheep by Means of Hormonal Manipulation." Australian Journal of Biological Sciences 41, no. 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

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Maxwell, W. M. C., and H. R. Wilson. "Fertility of fresh, chilled and frozen merino sheep embryos." Theriogenology 41, no. 1 (January 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, no. 3-4 (October 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, and Xavier Druart. "Mass sperm motility is associated with fertility in sheep." Animal Reproduction Science 161 (October 2015): 75–81. http://dx.doi.org/10.1016/j.anireprosci.2015.08.006.

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Boland, M. P., and T. F. Crosby. "Fecundin: An immunological approach to enhance fertility in sheep." Animal Reproduction Science 33, no. 1-4 (October 1993): 143–58. http://dx.doi.org/10.1016/0378-4320(93)90112-5.

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Bortoletti, G., F. Gabriele, V. Seu, and C. Palmas. "Epidemiology of hydatid disease in Sardinia: a study of fertility of cysts in sheep." Journal of Helminthology 64, no. 3 (September 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

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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

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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 = 0.0

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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, r

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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 measur

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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

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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, and B. E. Harrison. "Effects of Antibodies to Steroid Hormones on Reproductive Events of Sheep and Cattle." In 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." In 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, and Jesus Yaniz. "Management Factors Affecting Fertility in Sheep." In Artificial Insemination in Farm Animals. InTech, 2011. http://dx.doi.org/10.5772/18013.

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WINFIELD, C. G., and L. P. CAHILL. "MATING COMPETENCY OF RAMS AND FLOCK FERTILITY." In 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, and J. Pelletier. "Parameters of male fertility and their genetic variation in sheep." In 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, and Greg Curren. "Reproductive Rates of Merino Ewes and Offspring Quality under AI Program." In 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., and C. M. LANGFORD. "THE PREDICTION OF FERTILITY AND FECUNDITY FROM THE MATING ACTIVITY OF EWES." In 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, and M. R. Fleet. "The productivity of Bungaree, Booroola × Bungaree and Trangie Fertility × Bungaree Merino ewes in South Australia." In 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." In 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." In 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, and Nikolay Zlyidnev. "Application of unmanned aerial vehicles for remote estimation of pasture fertility while growing Dzhalginsky Merino sheep." In 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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