Developmental programming of reproduction in sheep and goat: Association of fraternity size and sex ratio with reproductive performance of ewes and does at the first pregnancy

IF 2.2 2区 农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE Animal Reproduction Science Pub Date : 2024-10-25 DOI:10.1016/j.anireprosci.2024.107622
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Abstract

Various prenatal factors including the number of littermates (fraternity size) and exposure to male littermate (fraternity sex ratio) during fetal period have been reported to influence postnatal fertility in the mammals. The present research was conducted to study the association of fraternity size and sex ratio with reproductive performance of nulliparous ewes and does. To this end, data associated with number of littermates, exposure to male littermate, birth weight, age at first pregnancy, as well as litter size, sex ratio of offspring, litter weight, and birth weight of female and male offspring after the first parturition retrieved from the database of sheep (n = 536 Romane and 289 Blanche du Massif Central ewes) and goat (n = 174 Alpine and 267 Saanen does) flocks. Fraternity size was negatively associated with birth weight of ewes and does (P < 0.05). Exposure to male littermate during fetal period was associated with younger age at first pregnancy and larger litter size in the does (P < 0.05), but not in the ewes (P > 0.05). Exposure to male littermate during fetal period was positively associated with the odds of male-biased litters in the ewes and does (P < 0.05). Fraternity size was positively associated with litter weight in the does (P < 0.05), but not in the ewes (P > 0.05). In conclusion, the present study showed that the number and sex of littermates during fetal period could impact postnatal reproduction of ewes and does. In this context, some associations, particularly those related to exposure to male littermate during fetal period, were only observed in does, which implicates that the effect of androgens on developmental programming of reproduction may be species-specific.
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绵羊和山羊的生殖发育程序:兄弟会规模和性别比例与母羊和初孕母羊繁殖性能的关系。
据报道,哺乳动物产前的各种因素,包括胎儿期的同窝产仔数(同窝产仔数)和与雄性同窝产仔数的接触(同窝产仔数性别比),都会影响产后的生育能力。本研究的目的是研究同窝产仔数和性别比与空怀母羊和雌性母羊繁殖性能的关系。为此,研究人员从绵羊(n = 536 头 Romane 母羊和 289 头 Blanche du Massif Central 母羊)和山羊(n = 174 头 Alpine 母羊和 267 头 Saanen 母羊)羊群数据库中检索了与产仔数、接触雄性产仔数、出生体重、首次怀孕年龄以及产仔数、后代性别比、产仔数体重和首次分娩后雌性和雄性后代出生体重相关的数据。博爱规模与母羊和母羊的出生体重呈负相关(P < 0.05)。胎儿期接触雄性同窝动物与母羊初孕年龄较小、产仔数较多有关(P < 0.05),但与母羊无关(P > 0.05)。母羊和母猪在胎儿期接触雄性同窝仔猪与偏雄性产仔几率呈正相关(P < 0.05)。母羊的兄弟关系大小与产仔数呈正相关(P < 0.05),而母羊的兄弟关系大小与产仔数无正相关(P > 0.05)。总之,本研究表明,胎儿期同窝生仔数和性别会影响母羊和母猪的产后繁殖。在这种情况下,某些关联,尤其是与胎儿期接触雄性胎伴有关的关联,仅在母羊中观察到,这表明雄激素对生殖发育程序的影响可能具有物种特异性。
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来源期刊
Animal Reproduction Science
Animal Reproduction Science 农林科学-奶制品与动物科学
CiteScore
4.50
自引率
9.10%
发文量
136
审稿时长
54 days
期刊介绍: Animal Reproduction Science publishes results from studies relating to reproduction and fertility in animals. This includes both fundamental research and applied studies, including management practices that increase our understanding of the biology and manipulation of reproduction. Manuscripts should go into depth in the mechanisms involved in the research reported, rather than a give a mere description of findings. The focus is on animals that are useful to humans including food- and fibre-producing; companion/recreational; captive; and endangered species including zoo animals, but excluding laboratory animals unless the results of the study provide new information that impacts the basic understanding of the biology or manipulation of reproduction. The journal''s scope includes the study of reproductive physiology and endocrinology, reproductive cycles, natural and artificial control of reproduction, preservation and use of gametes and embryos, pregnancy and parturition, infertility and sterility, diagnostic and therapeutic techniques. The Editorial Board of Animal Reproduction Science has decided not to publish papers in which there is an exclusive examination of the in vitro development of oocytes and embryos; however, there will be consideration of papers that include in vitro studies where the source of the oocytes and/or development of the embryos beyond the blastocyst stage is part of the experimental design.
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