title: Positive feedback by estrogen and progesterone on LH release in old and young rats.
mesh_terms: D000375:Aging; D000818:Animals; D002369:Castration; D004958:Estradiol / Q000494:pharmacology*; D004971:Estrus; D005246:Feedback; D005260:Female; D007030:Hypothalamo-Hypophyseal System / Q000187:drug effects*; D007986:Luteinizing Hormone / Q000378:metabolism*; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology*; D051381:Rats; D013997:Time Factors
chemical_list: D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone