影响杜泊绵羊超数排卵效果的因素分析

Factors affecting superovulation in Dorpor sheep

对53只杜泊绵羊实施超排处理，系统分析了供体羊年龄、胎次、重复超排、两次超排间隔时间、胚胎回收部位和季节对超数排卵效果的影响。结果表明，24月龄以上羊平均回收胚胎数显著高于8～12月龄羊（8．71：7．18）（P〈0．05）；8-12月龄羊可用胚胎所占比例显著高于13-24月龄羊（95．29％：75．96％）（P〈0．05）。经产二胎羊平均回收胚胎数显著高于初产羊（8．71：7．00）（P〈0．05）；初产羊可用胚胎所占比例显著高于经产一胎羊（96．14％：75．88％）（P〈0．05）。第三次超排处理平均回收胚胎数显著少于首次和第二次处理（8．71：8．10：7．00）（P〈0．05）；首次超排处理平均可用胚胎数高于第二次和第三次超排处理（7．47：5．90：5．00）（P〈0．05）。两次超排间隔10个月可用胚胎所占比例显著高于间隔1个月（92．14％：77．09％）（P〈0．05）。从输卵管平均回收胚胎数显著多于从子宫角平均回收胚胎数（10．14：8．22）（P〈0．05）。秋季超排处理平均可用胚胎数和可用胚胎所占比例均显著高于冬季（7．53：5．97）（91．67％：74．90％）（P〈0．05）。

To screen out the effect of age, embryo development stage, parities, repeated superovulation, time between supeovulation, recovered position, and season on superovulation in dorpor sheep,53 dorpor sheep were superovulated, the results demonstrated that the average recov- ered embryos of older 24 months sheep were significantly more than those of 8 -12 months sheep （8.71：7.18） （P 〈0.05） ;and the vability rate of 8-12 months sheep were significantly more than that of 13-24 months sheep （95.29 % ： 75.96 %） （P〈0.05）. The average recovered embryos of later 2 parities were significantly more than those of first parity （8.71 ： 7.00） （ P 〈 0.05 ） ; and the viability rat of first parity were significantly more than that of later 1 parities （96.14 % ： 75.88 % ） （P〈0.05）, The average recovered embryos of third superovulated sheep were significantly lower than those of first and second superovulated donors （8.71： 8.10： 7.00） （P 〈0.05 ） ; and the average viable embryos of first superovulated sheep were significantly more than those of second and third supemvulated donors （7.47： 5.90： 5.00） （ P 〈 0. 05）. The viability rate of 10 months between superovulation was significantly higher than that of 1 moth between superovulation （92.14 % ： 77.09 % ） （ P 〈 0.05 ）. The average recovered embryos from oviduct were significantly more than those from uerus corner（ 10. 14：8.22 ） （P〈0.05）. The average viable embryos and viability rate of sheep superovulated in autumn were significantly higher those of sheep superovu- lated in autumn winter（7.53：5.97 ） （91.67 % ： 74.90 % ） （ P 〈 0.05 ）.