David O. Kleemann , Jennifer M. Kelly , Kimberley M. Foyster , Alyce M. Swinbourne , Alice C. Weaver , Simon K. Walker
{"title":"短期和长期营养及黄体酮补充对母羊定时人工授精成功率的影响","authors":"David O. Kleemann , Jennifer M. Kelly , Kimberley M. Foyster , Alyce M. Swinbourne , Alice C. Weaver , Simon K. Walker","doi":"10.1016/j.anireprosci.2024.107477","DOIUrl":null,"url":null,"abstract":"<div><p>The success of fixed - time artificial insemination (AI) in the ewe is variable due to poor synchrony of estrus. We examined the effects of long-term nutrition (LTN; low, medium, high - 6 months), short-term nutrition (STN; 1.0 M, 1.5 M – 14 days) and progesterone supplementation (P; single pessary, replacement on Day 9) on synchrony and reproductive outcomes. High LTN advanced (<em>P</em> < 0.05) estrus, increased (<em>P</em> = 0.06) pregnancy (range 71.1 – 81.1%) and improved (<em>P</em> < 0.01) litter size (range 1.30 – 1.50). STN increased (<em>P</em> < 0.05) pregnancy (79.0 versus 72.3%) but not litter size or timing of estrus. A LTN x STN interaction (<em>P</em> < 0.01) for time of estrus indicates that the effects of LTN were moderated by STN depending on the level of LTN. Pessary replacement delayed (<em>P</em> < 0.05) the onset of estrus, improved synchrony but did not affect pregnancy or litter size. High LTN increased (<em>P</em> < 0.05) the number of large (≥ 3.8 mm) and medium - size follicles (2.0 – 3.7 mm) but the diameter of large follicles tended to be reduced (<em>P</em> = 0.08) on Day 12. STN did not affect follicle number or size whilst P reduced (<em>P</em> < 0.05) the diameter of large follicles on Day 12 (4.83 versus 5.10 mm) and increased the number of medium – size follicles (3.56 versus 2.74 mm). In conclusion, both LTN and STN are major sources of variability in AI programs whilst pessary replacement has potential to reduce variability.</p></div>","PeriodicalId":7880,"journal":{"name":"Animal Reproduction Science","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of short and long – term nutrition and progesterone supplementation on the success of fixed – time artificial insemination in the ewe\",\"authors\":\"David O. Kleemann , Jennifer M. Kelly , Kimberley M. Foyster , Alyce M. Swinbourne , Alice C. Weaver , Simon K. Walker\",\"doi\":\"10.1016/j.anireprosci.2024.107477\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The success of fixed - time artificial insemination (AI) in the ewe is variable due to poor synchrony of estrus. We examined the effects of long-term nutrition (LTN; low, medium, high - 6 months), short-term nutrition (STN; 1.0 M, 1.5 M – 14 days) and progesterone supplementation (P; single pessary, replacement on Day 9) on synchrony and reproductive outcomes. High LTN advanced (<em>P</em> < 0.05) estrus, increased (<em>P</em> = 0.06) pregnancy (range 71.1 – 81.1%) and improved (<em>P</em> < 0.01) litter size (range 1.30 – 1.50). STN increased (<em>P</em> < 0.05) pregnancy (79.0 versus 72.3%) but not litter size or timing of estrus. A LTN x STN interaction (<em>P</em> < 0.01) for time of estrus indicates that the effects of LTN were moderated by STN depending on the level of LTN. Pessary replacement delayed (<em>P</em> < 0.05) the onset of estrus, improved synchrony but did not affect pregnancy or litter size. High LTN increased (<em>P</em> < 0.05) the number of large (≥ 3.8 mm) and medium - size follicles (2.0 – 3.7 mm) but the diameter of large follicles tended to be reduced (<em>P</em> = 0.08) on Day 12. STN did not affect follicle number or size whilst P reduced (<em>P</em> < 0.05) the diameter of large follicles on Day 12 (4.83 versus 5.10 mm) and increased the number of medium – size follicles (3.56 versus 2.74 mm). In conclusion, both LTN and STN are major sources of variability in AI programs whilst pessary replacement has potential to reduce variability.</p></div>\",\"PeriodicalId\":7880,\"journal\":{\"name\":\"Animal Reproduction Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-04-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Animal Reproduction Science\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S037843202400068X\",\"RegionNum\":2,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRICULTURE, DAIRY & ANIMAL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Animal Reproduction Science","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S037843202400068X","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, DAIRY & ANIMAL SCIENCE","Score":null,"Total":0}
Effects of short and long – term nutrition and progesterone supplementation on the success of fixed – time artificial insemination in the ewe
The success of fixed - time artificial insemination (AI) in the ewe is variable due to poor synchrony of estrus. We examined the effects of long-term nutrition (LTN; low, medium, high - 6 months), short-term nutrition (STN; 1.0 M, 1.5 M – 14 days) and progesterone supplementation (P; single pessary, replacement on Day 9) on synchrony and reproductive outcomes. High LTN advanced (P < 0.05) estrus, increased (P = 0.06) pregnancy (range 71.1 – 81.1%) and improved (P < 0.01) litter size (range 1.30 – 1.50). STN increased (P < 0.05) pregnancy (79.0 versus 72.3%) but not litter size or timing of estrus. A LTN x STN interaction (P < 0.01) for time of estrus indicates that the effects of LTN were moderated by STN depending on the level of LTN. Pessary replacement delayed (P < 0.05) the onset of estrus, improved synchrony but did not affect pregnancy or litter size. High LTN increased (P < 0.05) the number of large (≥ 3.8 mm) and medium - size follicles (2.0 – 3.7 mm) but the diameter of large follicles tended to be reduced (P = 0.08) on Day 12. STN did not affect follicle number or size whilst P reduced (P < 0.05) the diameter of large follicles on Day 12 (4.83 versus 5.10 mm) and increased the number of medium – size follicles (3.56 versus 2.74 mm). In conclusion, both LTN and STN are major sources of variability in AI programs whilst pessary replacement has potential to reduce variability.
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.