Influence of environmental lighting on duration of pregnancy in the rat.
D000818:Animals; D001724:Birth Weight; D002940:Circadian Rhythm; D010064:Embryo Implantation; D004781:Environmental Exposure; D005260:Female; D008027:Light; D010870:Pineal Gland / Q000502:physiology*; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats; D013997:Time Factors