The higher percentage of expending and hatched embryos were obtained (31.75% and 22.33% in Borderdale and 25.89% and 31.75% in Poll Dorset respectively) on day 8 post oestrus.

• 配种后8天从波德代和无角陶赛特供体羊上所冲取的胚胎；以扩展囊胚和孵出囊胚为最多；分别占从两品种羊上所回收总胚的38.；92%25、22