摘要
本试验分析了291头14～15月龄荷斯坦青年母牛不同黄体大小对供体超排的效果。比较了924头受体母牛不同黄体大小对胚胎移植后妊娠率的影响。结果表明,埋栓前,黄体1.2cm组超排效果和有效胚胎数较高。黄体较小的组超排效果稍差一些。1.5cm以上黄体组的结果居中。受体母牛在移植胚胎时,0.8cm以上黄体的受体均获得了较高的妊娠率。但1.5cm以上黄体的受体妊娠率更高一些。由此结论提出:在超排前,黄体的大小与母牛体内孕酮浓度的高低和超排效果有关。受体在移植胚胎前,只要黄体的大小能保证最低妊娠所需的孕酮浓度,均能保证较好的妊娠率。黄体较大时,妊娠率有增加的趋势。
Two hundred and ninety-one Holstein heifers with 14-15 months age were superovulated and 924 recipients receivedfrozen embryos,in which heifers of donors and recipients had the different size of corpora lutea.The results showed that before CIDRinsertion the heifers with 1.2cm of corpora lutea had a better superovulation response and higher transferable embryo yield.Butthe group below 1.0cm of corpora lutea had a poor superovulation response.And meanwhile an acceptable pregnancy rate of therecipients was obtained in heifers/cows with corpora lutea over 0.8cm.The recipients had a higher pregnancy rate with over 1.5cm ofcorpora lutea.It can be conduded that the size of corpora lutea of donors was associated with superovulation response,progesteroneconcentrations and high embryo yield.Before the recipients receive embryos,an acceptable pregnancy rate would be obtained ifthe corpora lutea were over 0.8 cm with a good progesterone concentration for maintaining pregnancy.Furthermore,the higherpregnancy rate had an increasing trend when the corpora lutea size was increased.
出处
《中国奶牛》
2011年第9期35-37,共3页
China Dairy Cattle
关键词
黄体大小
超排
移植
供体
受体
Size of corpus lutea
Superovulation
Embryo Transfer
Donors
Recipients
