CIDR与GnRH诱导同期发情效果比较

[目的]为了观察CIDR与GnRH诱导同期发情的效果。[方法]本实验利用GnRH＋PG＋GnRH和CIDR＋EB＋P4＋PG对荷斯坦奶牛进行同期发情。CIDR组：在奶牛发情周期的任意一天（发情当天除外），于奶牛阴道内放CIDR同时肌注2mgEB和50mgP4，人为诱导卵泡的发生，在放入CIDR的第8d肌注PG；应用GnRH组与CIDR组同步进行同期发情处理：肌注GnRH7d后肌注PG，2d后再次肌注GnRH。[结果]表明：利用CIDR与Gn—RH两种同期方法同期发情率、情期受胎率差异均不显著。[结论]在实际生产中，GnRH便于操作，且发情略高于CIDR组。

Comparison of the Effect on CIDR and GNRH Inducing Estrus Synchronization

[Objective]This experiment was to investigate effect of the estrus synchronization induced by CIDR and GnRH. [Method]The GnRH ＋PG＋GNRH and CIDR＋EBq-P4＋PG were used to induce the Estrus Synchronization of Holstein. For the CIDR group： In order to induce the ovarian follicle occurrence, CIDR was put in the vagina of the dairy cattle at any day of the estrus cycle （not the day of estrus） with 2 mgEB and 50 mg P4 intramuscular injection at the same time. After the eighth day of intramuscular injection, CIDR was put again. GnRH group and CIDR group were to induce the synchronous estrus pro- cessing at the same time： muscle injecting PG after seven days of injecting GnRH. Two days later, muscle injecting GnRH again. [Result]The estrus synchronization rate and pregnancy rate of estrus had no significant difference. [Conclusion]GnRH was easy to operate in practice and the estrus synchronization rate was a little bit higher than CIDR.