[Demonstration of a critical period of ovarian activity in the control of early receptivity induced by estrogen in the female rat with 4-day cycles].
A significant decrease in early receptivity during the night from dioestrus II to prooestrus was observed in estrogen-treated 4-day cyclic rats following bilateral ovariectomy on dioestrus II at 4-5 p.m. Early receptivity appeared then to be dependent on the presence of ovary at this stage of the cycle. The mechanism whereby the adrenals may compensate for the ovaries when removed on dioestrus I, at 10-11 a. m. (Roos et al. 1973), was not observed in the present experimental conditions.
D000302:Adrenal Cortex / Q000502:physiology; D000315:Adrenalectomy; D000818:Animals; D002369:Castration; D004967:Estrogens / Q000502:physiology; D004971:Estrus; D005260:Female; D010053:Ovary / Q000502:physiology*; D011247:Pregnancy; D051381:Rats; D012726:Sexual Behavior, Animal
D004967:Estrogens
Mise en évidence d'une "période critique" de l'activité ovarienne dans le contrôle de la réceptivité précoce suscitée par l'oestrogène chez la ratte à cycles de 4 jours