Abstract
Pigtail monkeys ( Macaca nemestrina) were time-mated using female perineal “sex skin” tumescence cyclicity as an indicator of ovulation time. The goal of these matings was production of infants of known gestational age for an investigation using a nonhuman primate model to study causes, correlates, and consequences of premature birth. Two breeding strategies were employed. The first involved allowing breeders constant access to one another for 72 hours at the time ovulation was predicted to occur from previous data on cyclicity of perineal tumescence. The second method limited exposure to two hours daily until perineal detumescence occurred. The second strategy has been considerably more effective than the first.
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