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生殖功能依赖于丘脑下部、垂体前叶和性腺的整合作用。近10年来已广泛应用 LHRH 研究公牛的青春期前、青春期和青春后期垂体促性腺激素的分泌。以各年龄组的公牛对外源性 LHRH 发生的反应,表明在生命早期垂体就具有合成与分泌促性腺激素的能力。但与 LH 相反,在六个月以前的公牛,应用 LHRH 后未观察到睾酮分泌反应有显著变化。曾有报告,外源性 LHRH 的应用剂量与促性腺激素的分泌反应,在一定范围内相关。同时还表明外源性 LHRH 引起的 LH 分泌水平比自发性LH 分泌峰高25～30倍,而相应的睾酮增加仅在一
Reproductive function depends on the integration of the lower part of the hypothalamus, anterior pituitary and gonads. LHRH has been widely used in the past 10 years to study the secretion of pituitary gonadotropin in pre-puberty, adolescence and adolescence of the bull. The reaction of exogenous LHRH to bulls of all age groups showed that pituitary had the ability to synthesise and secrete gonadotropins early in life. However, in contrast to LH, no significant change in testosterone secretion was observed in the bulls six months prior to LHRH. It has been reported that the application of exogenous LHRH dose and gonadotropin secretion response, within a certain range. It has also been shown that LH secretion induced by exogenous LHRH is 25-30 fold higher than that of spontaneous LH secretion while the corresponding testosterone increase is only one