Embryos were collected on Day 7 post oestrus and two breeds ewes produced a much higher proportion of morula, they were 66.24% in Borderdale and 75.78% in Poll Dorset.

• 配种后7天从波德代和无角陶赛特供体羊上所冲取的胚胎；以桑椹胚为最多；分别占回收总胚的66.；24%25、75