The first and second repeated superovulation treatments in Borderdale and Poll Dorset gave 7.00,5.62 and 8.00,9.08 embryos in average respectively, among which the usable embryos accounted for 61.90%,72.60% and 87.50%,88.11% respectively in two breeds.

• 重复超排结果表明；波德代羊和无角陶赛特羊第一次和第二次超排后所获得的平均胚胎数分别为7.；00枚、5