二组同期发情方案及定时输精技术 提高牦牛受胎率效果观察

摘 要：为进一步研究牦牛发情不集中、受胎率低的问题，利用二组同期发情方案使牦牛在繁殖季节集中表现发情后定时输精，准确把握输精时机，提高牦牛受胎率。本试验选择在同一草场常年放牧、健康、膘情均达中等以上，年龄3-10岁母牦牛进行同期处理并严格控制处理和配种的时间，观察发情、受胎效果。结果显示，通过二组同期发情方案对牦牛同期发情处理，发情率、受胎率分别为 67%、76%、56%、64%，差异显著（P＜0.05），同期组2不论同期发情率还是受胎率明显高于同期组1，应加以示范推广。

Two sets of synchronized estrus plans and timed insemination techniques Observation on the effect of improving the conception rate of yaks

Abstract: In order to further study the problems of inconsistent estrus and low conception rate in yaks, a two group synchronous estrus scheme was used to concentrate the performance of yaks during the breeding season and perform timed insemination after estrus, accurately grasping the timing of insemination and improving the conception rate of yaks. This experiment selected female yaks aged 3-10 years old who were grazed year-round, healthy, and had moderate or above body fat on the same grassland for simultaneous treatment, and strictly controlled the time of treatment and breeding to observe the effects of estrus and conception. The results showed that the estrus and conception rates of yaks were 67%, 76%, 56%, and 64%, respectively, with significant differences (P<0.05) through two sets of synchronized estrus schemes. Group 2 had significantly higher estrus and conception rates than Group 1, and should be demonstrated and promoted.