Schneider F, Rommel P, Riedel B, Drossel M
Arch Exp Veterinarmed. 1980;34(5):683-91.
Studies into quantitative behaviours of oestradiol and progesterone in the blood plasma of six heads of prepuberal cattle, following superovulation treatment, using pregnant-mare serum gonadotropin (PMSG) and human chorionic gonadotropin (HCG) have shown the oestradiol concentrations to double, as early as two days after PMSG, and to go up to ten times their original values, after another four days had elapsed. Progesterone values increased, as early as along with induced oestrus, and, consequently, suggested scatter of the ovulation process. The maximum progesterone levels reached something in the vicinity of 100 ng/ml, following superovulation, and, consequently, were far in excess of anything recordable from spontaneously ovulating cyclic cattle. Hormone analyses were continued over six weeks from induced oestrus and superovulation, with evidence being produced to the effect that no permanent cyclic activity had been introduced. All calves rather returned to their prepuberal condition.
对六头青春期前母牛在使用孕马血清促性腺激素（PMSG）和人绒毛膜促性腺激素（HCG）进行超数排卵处理后血浆中雌二醇和孕酮定量行为的研究表明，早在PMSG注射后两天，雌二醇浓度就会翻倍，再过四天后会升至原始值的十倍。孕酮值早在诱导发情时就开始升高，因此表明排卵过程存在分散现象。超数排卵后，孕酮的最高水平达到了100 ng/ml左右，因此远远超过了自发排卵的周期性母牛可记录到的任何水平。从诱导发情和超数排卵开始，激素分析持续了六周，结果表明并未引入永久性的周期性活动。所有小牛都恢复到了青春期前的状态。
