摘要
应用CIDR加氯前列烯醇对受体牛进行同期发情处理,研究引进时间和不同的营养状况对受体牛同期发情影响的效果。结果显示,三个半月前引进的受体牛经过同期发情处理后,同期发情率93.75%,发情可用率90.69%;一个半月前引进的受体牛经过同期发情处理后,同期发情率77.21%,发情可用率77.05%。同期发情率和发情可用率介于两组受体牛之间差异为极显著(p<0.01);大部分受体牛在48h内表现发情,第一组发情牛所占比例为77.3%,第二组为77.2%;按饲养管理方法补充精料的受体牛平均发情率为80.37%,受体牛的平均发情可用率为79.23%,按当地饲养管理方法没有补充精料的受体牛的平均发情率为60.83%,平均可用率为60.30%,介于两个饲喂不同营养水平的受体牛群平均发情率和平均发情可用率之间差异极显著(p<0.01);可用受体牛中左侧黄体平均占31.36%,右侧黄体平均占68.64%,左侧黄体所占比例同右侧所占比例之间差异极显著(p<0.01),营养水平高的更能提高受体牛右侧黄体所占比例。通过本次研究可以证实受体牛在引进3.5个月后和处理前1.5个月进行补饲是获得较好同期发情效果的重要因素。
In order to study effect on synchronization of estrus to recipient bovines about introduction time and nutrition, recipient bovines were synchronized with CIDR and Cloprostenol. Results indicated that synchronization rate was 93.75% and estrus usable rate was 90.69% to recipient bovines introduced before 3.5 months. But synchronization rate was 77.21% and estrus usable rate was 77.05% to recipient bovines introduced before 1.5 months. So synchronization rate and estrus usable rate were significantly different (p<0.01)between two group recipient bovines; Most recipient bovines within 48th hour were with significant estrus symptom after CIDRs were taken, and estrus rate of two group recipient bovines were 77.3% and 77.2%, respectively; Mean estrus rate and mean estrus usable rate of recipient bovines, which were served with fine feedstuff and others, were 80.37% and 79.23%, but mean estrus rate and mean estrus usable rate of recipient bovines, which were served with ordinary feedstuff and others, were 60.83% and 60.30%, so mean estrus rate and mean estrus usable rate were significantly different (p<0.01)between two group recipient bovines; Mean left corpus luteum rate of recipient bovines was 31.36%, whereas mean right corpus luteum rate was 68.64%, so significant difference(p<0.01)were between two group recipient bovines with different corpus luteum, furthermore, improved nutrition could raised right corpus luteum rate of recipient bovines. It is substantiated that introduction time over 3.5 months and improved nutrition before 1.5 months were very important to synchronization of estrus to recipient bovines.
出处
《中国农学通报》
CSCD
2005年第6期29-31,106,共4页
Chinese Agricultural Science Bulletin
基金
国家科技部"十五"奶业重大科技专项"良种奶牛快速繁育关键技术研究与产业化开发"(2002BA518A01)
国家发展与改革委员会高技术产业化示范工程"肉牛胚胎工程系列技术产业化"项目(2000063)
