During two consecutive mating seasons from August 2001 to December 2002，we observed the sexual behavior 0f Sichuan golden monkeys in theChengdu Zoo and the Shanghai Wild Animal Park．We collected urine samples from females in the early morning．We also measured urinary estradiol and progesterone levels using radioimmunoassay. Based on the estradiol concentration during the menstrual cycle，we discovered that the length of the menstrual cycle was 286．33±1.67 days．The length of pregnancy was about 200 days．The level of estradiol after impregnation was significantly different with the level during the same period in the non-receptive part of the cycle．Thus we could diagnose early pregnancy infemale Sichuan golden monkeys by checking their urinary estradiol level．

作者：阎彩娥；蒋志刚；李春旺；曾岩；谭妮妮；夏述忠

来源：动物学报 2003 年 49卷 5期