The present study compared the occurrence of oestrus behaviour and ovulation in response to the insertion of CIDR devices plus a classical treatment with equine chorionic gonadotrophin (eCG; single dose at CIDR removal) or alternative treatments with gonadotrophin‐releasing hormone (GnRH, either in a single dose at 56 hr after CIDR removal, or in one dose at CIDR insertion and another dose at 56 hr after CIDR removal). The appearance of oestrus behaviour during reproductive season ranged between 84% and 95% and all females showing oestrus signs had subsequent ovulations. The response, during seasonal anoestrus, was similar in the group treated with eCG, but less than half of the females in the groups treated with GnRH showed oestrus signs in response to the treatment, although more than 80% of them showed resumption of ovulatory activity after the treatment. In conclusion, protocols based on GnRH administration offer similar yields to eCG‐based protocols during the reproductive season but occurrence of oestrus in response to GnRH‐based treatments is highly compromised during seasonal anoestrus.

中文翻译：

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繁殖期和非繁殖期羊与黄体酮/ eCG和黄体酮/ GnRH同步发情的比较效率。

本研究比较了CIDR装置插入后发情行为和排卵的发生，加上马绒毛膜促性腺激素（eCG;去除CIDR的单剂量）的经典疗法或促性腺激素释放激素（GnRH）的替代疗法。在CIDR移除后56小时服用一剂，或在插入CIDR时服用一剂，在移除CIDR之后56小时服用另一剂）。生殖季节发情行为的出现范围在84％到95％之间，所有显示发情迹象的雌性都有随后的排卵。eCG治疗组在季节性发情期间的反应相似，但GnRH治疗组中只有不到一半的女性表现出对治疗的发情迹象，尽管其中超过80％的患者在治疗后表现出排卵活性的恢复。总之，基于GnRH给药的方案在生殖季节的收率与基于eCG的方案相似，但是在季节性缺铁期中，基于GnRH的治疗导致发情的发生受到很大影响。