Light and the timing of ovulation in the guinea-pig.
D000818:Animals; D002940:Circadian Rhythm; D003624:Darkness; D004971:Estrus; D005260:Female; D006168:Guinea Pigs; D007962:Leukocytes; D008027:Light; D010060:Ovulation; D011247:Pregnancy; D013997:Time Factors; D014626:Vaginal Smears