多浪羊一年两产繁育技术的初步研究

A Primary Study on Reproductive Techniques of Two-parturitions-one-year in Dolang Ewes

采用孕酮阴道栓和孕马血清促性腺激素相结合的方法对秋季空怀和春季早期断奶的多浪羊母羊进行同期发情处理,探讨综合性频密繁育技术。结果表明:在一年两产的频密繁育过程中,秋季空怀母羊与春季早期断奶母羊同期发情率无显著性差异(97.2%vs 96.0%)(P>0.05);分别对上述同期发情的母羊实施人工授精,受胎率有显著性差异(82.9%vs 54.0%)(P<0.05);平均产羔数(1.4 vs1.3)及产双羔母羊比率(37.9%vs 26.7%)均无显著性差异(P>0.05)。试验证明,对多浪羊母羊实施频密繁育技术处理,可以实现一年两次产羔,提高母羊的生产性能。

Unpregnant Dolang ewes in autumn and after early-weaning were synchronized estrus with enestrusin and pregnant mare＇s gonadotrophin and artificially insemined. The results showed that in the course of two-parturitions-one-year, although there were no differences on the rates of estrus synchronization, the litter size （ 1.4 vs 1.3 ）and the twin lambing rate （37.9 % vs 26.7 % ）（P〉0.05）between the unpregnant ewes group in autumn and the early-weaning ewes in spring （97.2 % vs 96.0% ） （P〉0.05）, but there was a significant difference on the conception rate between the two groups （82.9 % vs 54.0 % ）（P〈0.05）. These results showed that by the treatment with the enestrusin and pregnant mare＇s gonadotrophin,the Dolang ewes could partum twice a year, and maintain a high reproductive performance.