关键词: 黑叶猴, 雌二醇, 孕酮, 雌性性行为, 等级

Abstract: From October 2003 to November 2004,early morning urine samples from 4 captive Francois langurs (Trachypithecus francoisi) (3 pregnant,1 in estrus)were collected while observations were made of their behaviors,in order to study relationships between urinary gonadal hormone levels and sexual behavior. Urinary estradiol and progesterone levels were measured using radioimmunoassay. During pregnancy,estradiol ascended gradually;progesterone remained at undectable levels until one month after impregnation. During the middle stage of pregnancy,females continued soliciting sexual activity,but these frequent solicitations did not correlate significantly with gonadal hormone level. During estrus,estradiol reached a peak level prior to ovulation and the frequency of sexual solicitations were positively correlated with estradiol level. Although gonadal hormone level did not correlate significantly (P>0.05)with the social rank of the females,females with higher social rank displayed a tendency of breeding earlier than others.

Key words: Estradiol, Progesterone, Rank-class, Sexual behavior, Trachypithecus francoisi