激素处理产后母牛对产犊间隔及卵巢状态的影响研究

Effects of Hormone Treatment for Postpartum Cow on Calving Interval and the Ovary Function

为了确定促黄体素释放激素A2(LRH-A2)和氯前列烯醇对缩短奶牛产犊间隔的影响,选择产后适宜的激素处理时间,选用51头年产奶量在5 000 kg^6 000 kg的经产荷斯坦奶牛,根据产后的时间分为对照组、试验Ⅰ组(产后2周)、试验Ⅱ组(产后20 d^40 d)、试验Ⅲ组(产后40 d^60 d),分别用LRH-A2、氯前列烯醇或LRH-A2+氯前列烯醇进行处理。并在每组随机选择3头,用B超观测处理前后奶牛的卵巢状态变化。结果表明,奶牛产后2周用LRH-A2处理,有利于缩短产犊间隔。

In order to understand the effects of LRH-A2 and cloprosterol on shortening calving interval and select the optimal time for LRH-A2 treatment, 51 postpartum Holstein cows,which milk yields were 5 000 kg-6 000 kg/305 d,were randomly divided into the control group, the group Ⅰ （two weeks postpartum）, group Ⅱ （20-40 days postpartum）, groupⅢ （40-60 days postpartum）,and injected LRH-A2, cloprosterol or LRH-A2-b cloprosterol,respectively. Three cows in each group were selected randomly and observed the changes of ovary pre-treatment and post-treatment with B-ultrasonography. The results showed that when LRH-A2 was injected postpartum 2 weeks, it contributed to shortening the calving interval.