Importance of inseminating only cows in estrus
Importance of inseminating only cows in estrus
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DOI：
10.1016/s0093-691x(00)00305-8
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发表时间：
2000-05-01
期刊：
影响因子：
2.8
通讯作者：
Foote, RH
中科院分区：
文献类型：
--
作者：
Sturman, H;Oltenacu, EAB;Foote, RH
繁殖效率是成功的奶牛场管理的关键组成部分。启动了一项研究，以评价在发情周期中期或妊娠期间对奶牛进行授精的发生率和后果。在一个研究牛群的242荷斯坦牛，在典型的农场条件下进行繁殖管理，牛奶孕酮（P-4）测定每周3次，至少120天产后。并将P-4周期与授精后6 wk的发情检测、配种记录及妊娠诊断结果进行比较。约19%的授精是在发情周期和妊娠母牛中P-4较高时进行的。妊娠母牛的授精导致约17%的诱导胚胎死亡或流产。在以色列，发情检测员接受了广泛的培训，以检测不发情的奶牛。他们拒绝了约16%的奶牛提交再授精，与95%的准确率拒绝44%的奶牛怀孕。在纽约州周围地区，奶牛接受再授精的模式与以色列和实验牛群相似。这些结果表明，更仔细的提交和拒绝可以减少不必要的精液使用，减少流产，并尽量减少长时间的产犊间隔，所有这些都有助于奶牛群操作的成功。(C)2000年，Elsevier Science Inc.
Reproductive efficiency is a key component in successful dairy farm management. A study was initiated to evaluate the incidence and consequences of inseminating dairy cows in the middle of the estrous cycle or while pregnant. In a research herd of 242 Holsteins, managed for reproduction under typical farm conditions, milk progesterone (P-4) was assayed 3 times per wk for at least 120 d postpartum. The P-4 cycle was compared with the estrus detection and breeding records and pregnancy diagnosis 6 wk after insemination. About 19% of the inseminations were performed when P-4 was high in the estrous cycle and in pregnant cows. Insemination of pregnant cows led to an estimated 17% induced embryonic death or abortion. In Israel, inseminators are extensively trained to detect cows not in estrus. They reject about 16% of the cows submitted for reinsemination, with a 95% accuracy of rejection of 44% of the cows that were pregnant. The pattern of submission of cows for reinsemination in areas around New York State was similar to Israel and to the experimental herd. These results indicate that more careful submission and rejection can reduce the unnecessary use of semen, reduce abortions and minimize long calving intervals, all contributing to the success of a dairy herd operation. (C) 2000 by Elsevier Science Inc.