高寒牧区柯尔克孜羊同期发情和人工授精试验

为了提高柯尔克孜羊的繁殖率,本试验选择处于繁殖季节的600只柯尔克孜羊,随机分为试验组和对照组,试验组母羊采用一次PG方法处理;对照组为母羊自然发情,不做任何处理。观察第一情期的发情情况和发情后卵巢状态,统计同期发情率、受胎率和产羔率。结果显示:试验组同期发情率60%(120/200)显著高于对照组20%(80/400),差异显著(P0.05)。试验和对照组处理后发情羊的卵巢状态相同,试验组和对照组受胎率分别为75%和78.7%,差异均不显著(P0.05),产羔率分别为94.4%和95.2%,差异均不显著(P0.05)结论:通过在高寒牧区使用一次PG法对处于繁殖季节的柯尔克孜羊进行处理不仅达到促进母羊发情同期化程度、集中进行人工授精的目的,而且取得了预期的同期发情率、受胎率及产羔率,值得广泛推广。

Experiment on Estrus Synchronization and Artificial Insemination of Kirgiz Sheep in Alpine Pastoral Region

To increase the reproduction rate of Kirghiz sheep, 600 Kirghiz sheep in reproduction season were selected and divided into two groups of experiment and comparison, the sheep in the experiment group are treated through pregnancy (PG) with one time, while another group are natural estrus with no any treatments. By observing the oestrus in the first season and the status of ovary after oestrus, and counting the rates of synchronous estrus, pregnancy and reproduction, it is showed that the synchronous estrus rate in the experimental group is 60%(120/200) that is obviously higher than the one in comparison group that is 20%(80/400), and the difference is significantly (P<0.05). The ovary status of estrus sheep after treatment is same in experiment and comparison group, the pregnancy rate is 75% and 78.7% respectively in experiment and comparison group, and the difference is not obvious (P>0.05), so is the one of reproduction rate that is 94.4%and 85.2% respectively. It is concluded that PG with one time for Kirgiz sheep in reproduction season in Alpine Pastoral region improves the level of sheep estrous synchronization and achieves the purpose of intensive artificial insemination, but reaches the expected rates of synchronous estrus, pregnancy and reproduction, so such method is worthy of widespread.