Pregnancy rates of postpartum beef cows that were synchronized using Syncro-Mate-B or the Ovsynch protocol.
Pregnancy rates of postpartum beef cows that were synchronized using Syncro-Mate-B or the Ovsynch protocol.
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使用 Syncro-Mate-B 或 Ovsynch 协议同步的产后肉牛的妊娠率。
DOI：
10.2527/1998.7661523x
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发表时间：
1998
影响因子：
3.3
通讯作者：
G. Niswender
中科院分区：
文献类型：
--
作者：
T. Geary;J. Whittier;E. R. Downing;D. Lefever;R. Silcox;M. Holland;T. Nett;G. Niswender
我们比较了采用传统的Syncro-Mate-B方案和新的Ovsynch方案和定时授精的肉牛的妊娠率。将436头经产期安格斯母牛按年龄、产后间隔和AI公牛进行分层，随机分为两组，进行同期发情/排卵试验。大约一半的奶牛(n=216)接受了传统的Syncro-Mate-B方案，从植入物取出到繁殖，48小时摘除小牛。其余220头母牛接受Ovsynch方案，包括d-10注射GnRH(100微克)，d-3注射PGF2pha(25 Mg)，48h去小牛，d-1再次注射GnRH和产犊，24 h后(D0)定时授精。在治疗前采集所有奶牛的血液样本，以识别发情和周期的雌性奶牛。Ovsynch处理组的妊娠率(54%)高于Syncro-Mate-B处理组(42%)(P<；0.025)。周期Ovsynch处理的母牛妊娠率(59%)高于周期Syncro-Mate-B处理的妊娠率(38%)(P<；0.005)。发情奶牛的妊娠率也倾向于与Ovsynch方案同步。根据这些数据，我们得出结论：Ovsynch方案能够诱导周期和无发情肉牛的排卵，并且定时受精的妊娠率高于使用Syncro-Mate-B同步发情获得的妊娠率。
We compared pregnancy rates of beef cows subjected to the traditional Syncro-Mate-B protocol or the new Ovsynch protocol and timed insemination. Multiparous Angus cows (n = 436) were stratified by age, postpartum interval, and AI sire and were randomly divided into two treatment groups for synchronization of estrus/ovulation. Approximately half of the cows (n = 216) received the traditional Syncro-Mate-B protocol with 48-h calf removal from the time of implant removal until breeding. The remaining cows (n = 220) received the Ovsynch protocol, which consists of an injection of GnRH (100 microg) on d -10, an injection of PGF2alpha (25 mg) and 48-h calf removal on d -3, another injection of GnRH and calf return on d -1, and timed insemination 24 h later (d 0). Blood samples were collected from all cows before treatment to identify anestrous and cyclic females. Pregnancy rates were higher (P < .025) for Ovsynch-treated cows (54%) than for Syncro-Mate-B-treated cows (42%). Pregnancy rates of cyclic Ovsynch-treated cows (59%) were higher (P < .005) than pregnancy rates of cyclic Syncro-Mate-B-treated cows (38%). Pregnancy rates of anestrous cows also tended to favor synchronization with the Ovsynch protocol. From these data, we conclude that the Ovsynch protocol is capable of inducing a fertile ovulation in cyclic and anestrous beef cows and that pregnancy rates to a timed insemination are higher than those obtained with synchronization of estrus using Syncro-Mate-B.