采用放置CIDR栓结合激素处理的方法，对204只供体和受体羊分别在冬季和春季进行同期发情处理和胚胎移植试验。结果表明，供体羊只冬季的发情率为90.9%，显著高于春季的发情率75.0%(P ＜ 0.05)；受体羊冬季的发情率84.0%，显著高于春季的发情率76.4%(P ＜ 0.05)。季节对供体母羊超数排卵个数、可利用卵子个数及卵子回收率均有不同影响，冬季供体羊只可利用卵子个数高于春季；冬季卵子回收率85.3%，显著高于春季的67.4%(P ＜ 0.05)。季节对受体母羊受胎率和繁殖率均有不同的影响，冬季受体羊的受胎率65.0%和春季受体羊的受胎率60.0%差异不显著(P ＞ 0.05)；冬季受体羊的繁殖率达到100.0%，显著高于春季受体羊的繁殖率82.0%(P ＜0.05)。

In this study，estrus treatment and embryo transfer in 204 donors and recipient sheeps were performed in winter and spring respectively，using the method of placing CIDR combined with hormone treatment. The results showed that the oestrus rate of winter donor sheep was 90.9%， significantly higher than that of spring donor sheep(75.0%) (P < 0.05)， and that of winter recipient sheep was 84.0%， which was significantly higher than that of spring sheep (P < 0.05). The number of superovulation， the number of available ovum and the recovery rate of ovum in donor seasons also had different effects in winter. The number of oocytes available to donor sheep in winter was higher than the number of eggs available in spring， the recovery rate of eggs in winter was 85.3%， significantly higher than that in spring (67.4%)(P < 0.05). The seasons had different effects on the pregnancy rate and reproduction rate of recipient ewes. (P < 0.05). The reproduction rate of recipient sheep in winter was 100.0%， which was significantly higher than that of spring sheep (82.0%) (P < 0.05).

S814.6

嘉峪关市科技局重大专项“肉羊高效繁育技术研究与示范”(15-21)。