title: Nutritional and environmental factors affecting gestation length in rhesus monkeys.
abstract: 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 of difference can be attributed to their greater birthweight. Summer conception produced longer gestation than did winter conception. Large mothers carried their infants slightly longer than small ones.
mesh_terms: D000818:Animals; D001724:Birth Weight; D001835:Body Weight; D004044:Dietary Proteins / Q000008:administration & dosage*; D005260:Female; D005306:Fertilization; D005865:Gestational Age; D000882:Haplorhini; D008251:Macaca / Q000502:physiology*; D008253:Macaca mulatta / Q000502:physiology*; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal; D012621:Seasons; D012737:Sex Factors; D013696:Temperature
chemical_list: D004044:Dietary Proteins