Reproductive Senescence among Female Japanese Macaques (Macaca fuscata fuscata)

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Abstract
Data on the reproduction of the 28 Arashiyama West and Arashiyama B Japanese macaque females 18 years and older are surveyed. Analysis of the data suggest that, despite parturition by a 25-year-old female, the fertility of females usually ends after 22 years of age. However, the data also suggest that the decline in fertility is not due to menopause because the aging females continue to experience estrus similar to that of younger females, differing primarily in that the estrous periods of the aging females are shorter in duration than are those of the younger females. On the other hand, a close inspection of the birth rates of the Arashiyama West troop, which was transported from Japan to South Texas in 1972, indicates that the reproduction of the older females was affected less by the consequences of transportation than that of the younger females.

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