不同季节绒山羊同期发情效果研究

 试验旨在研究不同季节绒山羊同期发情处理效果，为绒山羊胚胎移植和绒山羊养殖采用新繁殖技术实现集约化、工厂化生产管理提供配套技术。在2007~2008两年期间的四个季节，利用孕激素阴道栓（CIDR）+孕马血清（PMSG）方法，对766只绒山羊进行同期发情处理，48 h内有730只羊发情，发情羊第7 d在进行绒山羊胚胎移植时观察卵巢卵泡发育及排卵情况。结果表明：春、夏、秋、冬季绒山羊的同期发情率分别为94.08%、90.59%、97.54%、92.68%，平均为95.30%。经X2检验，秋季与夏季绒山羊的同期发情率（P＜0.01）存在显著差异，其它季节绒山羊的同期发情率（P＞0.05）差异不大。春、夏、秋、冬季发情绒山羊的排卵率分别为92.31%、90.91%、95.20%、91.23%，平均为93.56%。经X2检验，四个季节发情绒山羊的排卵率（P＞0.05）没多大差异。试验结果表明在四个季节对绒山羊采用的CIDR+ PMSG同期发情处理方法可行，发情率和排卵率均在90%以上，效果好且稳定。季节虽然对绒山羊同期发情率有一定影响，但对发情绒山羊排卵率影响不大。

Effect of Synchronization of Estrus of Cashmere Goat in Different Seasons

This research intended to study the effects of estrus synchronization on cashmere goats in different seasons,to employ new reproduction technology for embryo transplantation and breed on cashmere goats,to supply matching technology for intensive and factory production management.During four seasons in 2007 to 2008,766 cashmere goats with low production were disposed by synchronization of estrus with CIDR + PMSG method.730 goats estrused in 48 hours,and follicular development and ovulation situation were observed on the seventh day when embryo transplanted.The results showed synchronized estrus rate in spring,summer,autumn and winter were 94.08%,90.59%,97.54% and 92.68%,respectively with the average of 95.30%.By X2 inspection,synchronized estrus rate between summer and autumn showed significant difference(P<0.01),synchronized estrus rate between autumn and winter showed insignificant difference(P<0.05).However,this difference can not be found among other seasons(P>0.05).As for ovulation rate,92.31%,90.91%,95.20% and 91.23% were for spring,summer,autumn and winter,respectively,and the average was 93.56%.Through X2 inspection,ovulation rate showed no differences among different seasons(P>0.05).The results indicated that,the treatment of estrus synchronization which used CIDR+ PMSG on cashmere goats in four seasons was practicable,estrus rates and ovulation rates were all above 90%,and the efficiency was good and stabilized.The rates of estrus synchronization on cashmere goats were partly affected by season,but which had not large influence on ovulation rate on estrous cashmere goats.