{"title":"co - sync可提高无排卵哺乳期牛的排卵时间、周期和妊娠","authors":"Concepción Ahuja, Felipe Montiel","doi":"10.1016/j.livprodsci.2005.02.006","DOIUrl":null,"url":null,"abstract":"<div><p>Induction of ovulation for timed artificial insemination (TAI) was evaluated in postpartum anovulatory and lactating <em>Bos taurus</em>/<em>Bos indicus</em> cows (<em>n</em> <!-->=<!--> <!-->50). Palpation per rectum and transrectal ultrasonography were used on days −<!--> <!-->30, −<!--> <!-->20, −<!--> <!-->10 and 0 (day 0<!--> <!-->=<!--> <!-->start of treatment) to confirm the anovulatory status but with ovarian follicles ≥<!--> <!-->10 mm on day 0, and on the days of PGF<sub>2α</sub> injection and pregnancy diagnosis to determine rates of ovulation and induction of cyclicity. Cows were randomly assigned to: (1) CO-Synch (<em>n</em> <!-->=<!--> <!-->25; day 0, 200 μg GnRH; day 7, 150 μg PGF<sub>2α</sub>; day 9, 200 μg GnRH<!--> <!-->+<!--> <!-->TAI) and (2) control (<em>n</em> <!-->=<!--> <!-->25; no treatment). Rates of ovulation for the first GnRH injection, pregnancy and cyclicity induction were greater for CO-Synch (<em>P</em> <!--><<!--> <!-->0.05). There was no effect of body condition score (BCS) (<em>P</em> <!-->><!--> <!-->0.05). In conclusion, the CO-Synch protocol resulted in acceptable rates of cyclicity induction and pregnancy to TAI in anovulatory and lactating <em>B. taurus</em>/<em>B. indicus</em> cows under tropical conditions.</p></div>","PeriodicalId":92934,"journal":{"name":"Livestock production science","volume":"96 2","pages":"Pages 279-283"},"PeriodicalIF":0.0000,"publicationDate":"2005-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.livprodsci.2005.02.006","citationCount":"7","resultStr":"{\"title\":\"CO-Synch enhances time to ovulation, cyclicity and pregnancy in anovulatory lactating Bos taurus/Bos indicus cows\",\"authors\":\"Concepción Ahuja, Felipe Montiel\",\"doi\":\"10.1016/j.livprodsci.2005.02.006\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Induction of ovulation for timed artificial insemination (TAI) was evaluated in postpartum anovulatory and lactating <em>Bos taurus</em>/<em>Bos indicus</em> cows (<em>n</em> <!-->=<!--> <!-->50). Palpation per rectum and transrectal ultrasonography were used on days −<!--> <!-->30, −<!--> <!-->20, −<!--> <!-->10 and 0 (day 0<!--> <!-->=<!--> <!-->start of treatment) to confirm the anovulatory status but with ovarian follicles ≥<!--> <!-->10 mm on day 0, and on the days of PGF<sub>2α</sub> injection and pregnancy diagnosis to determine rates of ovulation and induction of cyclicity. Cows were randomly assigned to: (1) CO-Synch (<em>n</em> <!-->=<!--> <!-->25; day 0, 200 μg GnRH; day 7, 150 μg PGF<sub>2α</sub>; day 9, 200 μg GnRH<!--> <!-->+<!--> <!-->TAI) and (2) control (<em>n</em> <!-->=<!--> <!-->25; no treatment). Rates of ovulation for the first GnRH injection, pregnancy and cyclicity induction were greater for CO-Synch (<em>P</em> <!--><<!--> <!-->0.05). There was no effect of body condition score (BCS) (<em>P</em> <!-->><!--> <!-->0.05). In conclusion, the CO-Synch protocol resulted in acceptable rates of cyclicity induction and pregnancy to TAI in anovulatory and lactating <em>B. taurus</em>/<em>B. indicus</em> cows under tropical conditions.</p></div>\",\"PeriodicalId\":92934,\"journal\":{\"name\":\"Livestock production science\",\"volume\":\"96 2\",\"pages\":\"Pages 279-283\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2005-09-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/j.livprodsci.2005.02.006\",\"citationCount\":\"7\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Livestock production science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0301622605000771\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Livestock production science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301622605000771","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
CO-Synch enhances time to ovulation, cyclicity and pregnancy in anovulatory lactating Bos taurus/Bos indicus cows
Induction of ovulation for timed artificial insemination (TAI) was evaluated in postpartum anovulatory and lactating Bos taurus/Bos indicus cows (n = 50). Palpation per rectum and transrectal ultrasonography were used on days − 30, − 20, − 10 and 0 (day 0 = start of treatment) to confirm the anovulatory status but with ovarian follicles ≥ 10 mm on day 0, and on the days of PGF2α injection and pregnancy diagnosis to determine rates of ovulation and induction of cyclicity. Cows were randomly assigned to: (1) CO-Synch (n = 25; day 0, 200 μg GnRH; day 7, 150 μg PGF2α; day 9, 200 μg GnRH + TAI) and (2) control (n = 25; no treatment). Rates of ovulation for the first GnRH injection, pregnancy and cyclicity induction were greater for CO-Synch (P < 0.05). There was no effect of body condition score (BCS) (P > 0.05). In conclusion, the CO-Synch protocol resulted in acceptable rates of cyclicity induction and pregnancy to TAI in anovulatory and lactating B. taurus/B. indicus cows under tropical conditions.
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