The necessity for progesterone with estrogen for the induction of recurrent estrus in the ovariectomized ewe.
D000818:Animals; D002369:Castration; D004967:Estrogens; D030762:Estrous Cycle / Q000187:drug effects*; D004971:Estrus; D005260:Female; D006801:Humans; D008297:Male; D009919:Orchiectomy; D011374:Progesterone / Q000494:pharmacology*; D012756:Sheep
D004967:Estrogens; D011374:Progesterone
CASTRATION/effects; ESTROGENS/effects; ESTRUS CYCLE/effect of drugs on; PROGESTERONE/effects