摘要
用放射免疫法测定了两头雌性大熊猫发情期尿中雌二醇与孕酮含量及妊娠期尿中孕酮含量的变化。发情期开始,雌二醇量逐渐升高,在发情高潮期达高峰值。孕酮量则在发情高潮期下降,在发情后期上升。在发情高潮期雌二醇出现高峰的当日和次日配种,获致妊娠产仔。妊娠期尿中孕酮含量的变化特点是:在妊娠早期与晚期升高,晚期最高,妊娠中期停滞在低水平上波动,分娩前孕酮值迅速下降。
Changes of urinary sex steroid hormone levels of two female giant pandas were determind by radioimmunoassay during the estrous cycle and pregnancy. In two giant pandas,the estrous period occurs in April and May.The length of es- trous cycles varies from 15 to 18 days.The onset of their estrus is associated with gradual increase of urinary estradiol. During the estrus,the decline in the levels of urinary progesterone is accompanied by rapid rise of the estradiol levels up to the peak value(28.2—55.47 ng/mg creatinine), and then falling to the baseline level.The date of the maximum sexual activity or natu- ral mating occurs one day after that of the urinary estradiol peak or at that same day. Progesterone levels (mean) are low at the date of mating and increase abruptly after 2—3 days,and continue to rise until the day of 31th then decline to levels of proestrus. The length of the gestation periods for the two giant pandas is 139 and 152 days. The characteristic change of urinary progesterone levels during pregnancy,the uninary gesterone levels increase during first month of pregnancy,tyen decline to low levels and remain low levels for two to three month. Afler that the lenels of urinary gesterone increase again and remain of higy levels until two weeks before parturition.
出处
《动物学杂志》
CAS
CSCD
北大核心
1993年第2期25-28,共4页
Chinese Journal of Zoology
