孕马血清促性腺激素和人工授精时间对限饲孕激素处理母羊繁殖力的影响。

Influence of PMSG and time of artificial insemination on fertility of progestogen-treated sheep in confinement.

作者信息

Langford G A

出版信息

J Anim Sci. 1982 Jun;54(6):1205-11. doi: 10.2527/jas1982.5461205x.

DOI:10.2527/jas1982.5461205x

Abstract

The need for pregnant mates' serum gonadotropin (PMSG) in breeding confined sheep by artificial insemination (AI) at progestogen-synchronized estrus was assessed in 152 adult crossbred ewes brought into season by a controlled light regimen. One-half of the ewes received 500 IU PMSG after intravaginal progestogen treatment; all ewes were inseminated either 54, 57 or 60 h after sponge removal or at 54 and again at 60 h. Based on progesterone determinations 18 d after AI, conception rates with single insemination 54, 57, or 60 h and double insemination at 54 and 60 h were 76, 72, 47 and 72%, respectively, among ewes receiving PMSG, compared to 17, 22, 47 and 43%, respectively, among ewes not give PMSG (P less than .01) Lambing rates were higher (P less than .01) with PMSG (67, 67, 37 and 61%) than without PMSG (11, 11, 26 and 33%). While there was only a small increase (.06 less than P less than .05) in litter size with PMSG, fecundity decreased (P less than .01) from 1.4 to .3 when PMSG was not used. These data indicate that, even with controlled lighting to induce estrous activity, additional stimulation of ovulation by PMSG at progestogen-synchronized estrus is necessary for normal fertility when confined sheep are bred by AI.

摘要

在152只通过控制光照周期进入繁殖季节的成年杂交母羊中，评估了在孕激素同步发情时通过人工授精（AI）饲养圈养绵羊时对孕马血清促性腺激素（PMSG）的需求。一半的母羊在阴道内孕激素处理后接受500国际单位的PMSG；所有母羊在取出海绵栓后54、57或60小时进行人工授精，或在54小时和60小时各进行一次人工授精。根据人工授精后18天的孕酮测定结果，接受PMSG的母羊中，在54、57或60小时进行单次人工授精以及在54小时和60小时进行两次人工授精的受孕率分别为76%、72%、47%和72%，而未接受PMSG的母羊的受孕率分别为17%、22%、47%和43%（P<0.01）。接受PMSG的母羊产羔率（67%、67%、37%和61%）高于未接受PMSG的母羊（11%、11%、26%和33%）（P<0.01）。虽然使用PMSG时产仔数仅有小幅增加（0.06<P<0.05），但不使用PMSG时繁殖力从1.4降至0.3（P<0.01）。这些数据表明，即使通过控制光照来诱导发情活动，在孕激素同步发情时，当对圈养绵羊进行人工授精时，PMSG对排卵的额外刺激对于正常生育能力是必要的。