Environmental and endocrine factors influencing annual changes in sexual potency in primates
- PMID: 825897
- DOI: 10.1016/0306-4530(76)90019-6
Environmental and endocrine factors influencing annual changes in sexual potency in primates
Abstract
PIP: A summary is presented of available data on breeding seasonality in primates. 15 female rhesus monkeys, whose Fallopian tubes had been ligated to prevent pregnancy, were paired with intact males in a laboratory in London; the timing of the annual increase (autumn) in mating activity was similar to that in India. 4 ovariectomized, estrogen-treated females were paired with intact males in a laboratory in Atlanta with strictly controlled photoperiod; the annual increase in mating activity persisted during the 1st year but in a less circumscribed rhythm than that of intact feral animals. In a sham-castrated group during the 2nd year in a fixed photoperiod, the annual increase in sexual activity virtually disappeared. A castrated, testosterone-treated group in the 2nd year of a fixed photoperiod, showed a brief increase in sexual activity at the expected time. Ovariectomized, estrogen-treated female rhesus monkeys paired with castrated, testosterone-treated males in a laboratory in London showed a seasonal increase in sexual activity at the expected time, indicating that it was not entirely dependent upon pituitary activation of the gonads.
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