Harley D
Am J Phys Anthropol. 1990 Oct;83(2):253-61. doi: 10.1002/ajpa.1330830213.
Analysis of data on age and reproductive performance in 16 captive female Hanuman langurs (Presbytis entellus) shows that adult females under the age of 6 years and over the age of 19 years had the lowest rates of reproductive success as measured by the production of viable young that survived beyond 30 days of age. With the possible exception of one female, females over the age of 19 years experienced a variety of idiosyncratic reproductive problems but did not experience a true menopause as defined by total cessation of menstrual cycles. There was no support for the hypothesis that langur monkey females have evolved a lengthy postreproductive period.
对16只圈养雌性哈努曼叶猴（食蟹猴）的年龄和繁殖性能数据进行分析后发现，以存活超过30天的有活力幼崽数量来衡量，6岁以下和19岁以上的成年雌性繁殖成功率最低。除了一只雌性可能是例外，19岁以上的雌性经历了各种特殊的生殖问题，但并未出现月经周期完全停止所定义的真正绝经。没有证据支持叶猴雌性进化出较长的繁殖后期这一假设。
