Effects of handling and the light-dark cycle on time of parturition in the rat.
D000818:Animals; D003624:Darkness; D036861:Delivery, Obstetric / Q000662:veterinary*; D005260:Female; D005865:Gestational Age; D006234:Handling, Psychological; D008027:Light; D010507:Periodicity; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats / Q000502:physiology*; D013045:Species Specificity