title: [The length of the fertility period of the rat spermatozoa].
abstract: 4-day cyclic Wistar female rats were caged with sexually experiences males at either 18:00-19:00 on proestrus or at 21:30-22:30 during the following night. 16 out of 17 bulbectomized females and 16 out of 40 intact females respectively mated at 18:00-1900. 22 out of 24 intact females mated at 21:30-22:30. Only 11 out of the 32 receptive females became pregnant in the first group while 14 out of the 22 receptive females went into pregnancy in the second group. It is then supposed, given that ovulation does not take place before midnight during the night from proestrus to estrus in the rat that the fertilizing capacity of spermatozoon is of relatively short duration in the rat.
mesh_terms: D000818:Animals; D004971:Estrus; D005260:Female; D005298:Fertility; D005306:Fertilization; D008297:Male; D010060:Ovulation; D011247:Pregnancy; D011359:Proestrus; D051381:Rats; D013094:Spermatozoa / Q000502:physiology*; D013997:Time Factors
vernacular_title: Données nouvelles sur la durée du pouvoir fécondant du spermatozoïde chez le rat.