Breeding Macaca Nemestrina: A Program of Birth Engineering

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Abstract
Four years'' experience with a modest-sized colony of pig-tailed monkeys (Macaca nemestrina) indicates that births of animals at predetermined times can be arranged for scheduled experiments requiring pairs of infants of similar age. The pairing method of mating and an optimal mating time based upon tumescence of the sexual skin have been utilized. A menstrual cycle of 30 to 40 days, with follicular and luteal phases of about equal length, has been observed. Pregnancy is conclusively determined radio-graphically after the 75th day of probable gestation. Successful controlled breeding of this species indicates that it is potentially readily available for studies of pregnant, neonatal and age-known animals.

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