Nutritional and environmental factors affecting gestation length in rhesus monkeys

Forty-five pregnancies in rhesus monkeys maintained in a semioutdoor environment and fed about 1, 2, or 4 g of protein/kilogram of body weight each day in otherwise equivalent diets were observed. The 4-g diet shortened gestation 8.5 days. Male infants were carried 6 days longer than females; part o...

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