The blood samples were collected from pituitary portal vessels and jugular by surgery during the middle luteal phase or early follicular phase in she goats. GnRH in pituitary blood samples and LH and FSH in jugular ones were measured respectively by RIA.

• 通过外科手术分别连续收集活体山羊中黄体期及早卵泡期的垂体门脉血样和外周血样，经放射免疫测定，山羊中黄体期和早卵泡期的促性腺激素释放激素（GnRH）、促黄体生成素（LH）和促卵泡素（FSH）均呈波动式释放。