Reproductive function in aged female chimpanzees.

  title={Reproductive function in aged female chimpanzees.},
  author={Charles E. Graham},
  journal={American journal of physical anthropology},
  volume={50 3},
Reproductive function was evaluated in ten female chimpanzees (Pan troglodytes) aged 35-48 years. Forty-eight years is the longevity record for the chimpanzee. Data on cycle frequency and duration was available for seven animals. Most were cycling regularly until death, and all had experienced at least one menstrual cycle within one year of death. After exclusion of periods when the animals were pregnant or in postpartum amenorrhea, the mean cycle frequency (+/- standard error)/year was 9.54… CONTINUE READING

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