奶山羊发情具有一定的季节性,每年的 4~7 月份属于乏情季节,为了提高种山羊的利用率,扩大种群规模,实现全年均衡生产,必须突破乏情季节奶山羊繁殖率低的瓶颈.本试验将 150 只适繁奶山羊随机分为 3 组,每组 50 只,第 1 组以全混合日粮(TMR)为载体投放孕酮微囊包被液态制剂+PMSG+PG处理,第 2 组以阴道硅胶支架(CIDR)+PMSG+PG处理,第 3 组不做任何处理.结果表明,在相同饲养条件下,第 1、2 组同期发情率较高,差异不显著(P>0.05),但显著高于第 3 组(P<0.05);但发情母羊人工授精后的妊娠率显示第 1 组和第 3 组显著高于第 2 组(P<0.05),说明在乏情季节对奶山羊应用孕酮微囊包被液态制剂可以有效减少生殖道投药的不利影响,可以有效提高种羊的利用率,为实现舍饲奶山羊快速扩繁提供技术支撑.
[Absrtact]The estrus of dairy goats has a certain seasonality,and from April to July each year belongs to the lackluster season.In order to improve the utilization rate of breeding goats,expand the population size and achieve balanced production throughout the year,the bottleneck of low reproductive rate of dairy goats in the lackluster season must be broken through.In this study,150 suitable breeding dairy goats were randomly divided into 3 groups with 50 goats in each group.The first group was treated with liquid preparation +PMSG+PG using TMR as the carrier,the second group was treated with CIDR+PMSG+PG,and the third group was treated without any treatment.The results showed that under the same feeding conditions,the estrus rate of groups 1 and 2 was better,and the difference was not significant(P>0.05),but was better than that of group 3,and the difference was significant(P<0.05).However,the pregnancy rate of estrus ewes after artificial insemination showed that the pregnancy rate of groups 1 and 3 was higher than that of group 2,and the difference was significant(P<0.05),indicating that the application of progesterone microencapsulated liquid preparation to dairy goats in the barren season can effectively reduce the adverse effects of reproductive tract administration,effectively improve the utilization rate of breeding sheep,and provide technical support for the rapid propagation of farmed dairy goats.