利用氯前列烯醇诱导奶牛同期发情及定时输精效果分析

摘要

[目的]建立一套适合奶牛同情发情及定时输精配种的实用技术,以达到缩短产犊间隔,提高受胎率和牛群的繁殖力.[方法]采用不同给药方式对奶牛进行同期发情处理,并比较研究了定时输精技术对受胎率的影响.[结果]①采用注射2次氯前列烯醇的试验Ⅱ组、试验V组的同期发情率极显著高于采用注射1次氯前列烯醇的试验Ⅰ(P＜O.01)、Ⅳ组(P＜0.01)；②采用子宫颈内注入氯前列烯醇的效果较好,试验Ⅵ组(子宫颈内注入2次)的同期发情率和受胎率均高于试验Ⅱ组(肌肉注射2次)(P＞0.05),试验Ⅳ组(子宫颈内注入1次)的同期发情率和受胎率也高于试验Ⅰ组(肌肉注射1次)(P＞0.05)；③采用定时输精方法的试验Ⅲ组、试验Ⅵ组的受胎率分别显著高于试验Ⅱ(P ＜0.05)、V组的受胎率(P＜0.05),试验Ⅲ和Ⅵ组的受胎率差异不显著(P＞0.05),试验Ⅱ和V组的受胎率差异不显著(P＞0.05).[结论]定时输精技术不仅可以省去观察发情,还可以减少因发情鉴定不及时和隐性发情造成的漏配,具有很高的推广应用价值.%[Objective] The fertility of cow and its multiplication were improved through the establishment of a set of practical techniques of · Cow estrus at same time for shorter calving interval. [Method] The fertility of cow under timed insemination was compared based on the synchronization estrus after different treatments of medicine delivery. [Results] The rate of synchronization cow estrus in the Test Group II and Test Group V with 2 times' cloprostenol injection was significantly higher than that of Test Group I and Test GroupIV (P < 0.01) with 1 time' s cloprostenol injection. The effect of the cloprostenol injected into the cervix was better than others and the rate synchronization estrus and fertility of cow in the Test Group VI (cervical injection for 2 times) were higher than those in Test Group II (intramuscular injection for 2 times) (P > 0. 05 ) and the rate synchronization estrus and fertility of cow in the Test Group IV ( cervical injection for 1 time) was also higher than that in Test Group I (intramuscular injection for 1 time) (P > 0.05 ). The fertility of cow in the Test Group M and the Test Group VI with timed insemination method was significantly higher than that in Test Group II and Test Group V(P <0.05) , there was no difference in the fertility of cow between Test Group Ⅲ and Test Group VI and also between Test Group II and Test Group V · [Conclusion] The method of timed insemination technology can not only eliminate the need for observation of estrus, but also reduce the leakage of insemination because of the identification of estrus and latent estrus. The technique was with high value in practical promotion and application.