雌性小熊猫粪样中雌二醇与孕酮水平的变化与繁殖启动的关系

于1999年12月-2000年4月在成都动物园和成都大熊猫繁育研究基地，用放射免疫分析法测定了4只雌性小熊猫（Ailurus fulgens)粪样中雌二醇(E2)和孕酮(P)水平的变化，同时对其交配行为进行了观察。研究结果表明：雌性小熊猫进入发情期后，粪样中E2迅速升高，并多次出现峰值，表明小熊猫可能是季节性多发情动物。交配行为发生前E2出现峰值，P水平上升，说明E2和P是启动雌性小熊猫交配行为的重要因素；未伴随有P水平相对上升的E2峰值不能引起雌性小熊猫发生交配行为，该现象为暗发情。交配行为发生后P水平持续升高，据此推断小熊猫的排卵方式可能是诱导排卵，诱导因子是交配刺激。

Relationship Between Fecal Estradiol and Progesterone Concentrations and Reproductive Startup in Female Red Pandas (Ailurus fulgens)

By radioimmunoassays, we analyzed fecal estradiol (E_2) and progesterone (P) concentrations of four female red pandas (Ailurus fulgens) from Chengdu Zoo and Chengdu Research Base of Giant Panda Breeding from December 1999 to April 2000. Meantime, we investigated mating activity of the red pandas. The results showed that there was a rapid increase in E_2 concentration, accompanying several peaks. This implied that female red pandas might be seasonally polyestrous. Before mating, E_2 concentration reached the peak, meanwhile, P concentration also increased. This indicated E_2 and P were both important factors for promoting the female's mating activity. The copulation couldn't occur when E_2 concentration reached the peak without P concentration increase, which was a dark rut. P concentration increasing continually after mating, presumably, an ovulation phenomenon had occurred according to the female's kittening later. This implies that the ovulation mode of red pandas primarily is inductive, and the inductive factor is mating stimulation.