title: Plasma testosterone levels are higher in old mating rats than in old non-mating rats.
abstract: About one-half of 96 aged rats mated at 20 months of age. Their plasma LH and prolactin concentrations were similar to those in non-mating old rats, but their plasma testosterone concentrations were significantly higher. Exogenous testosterone administration failed to change the sexual status of the non-mating group.
mesh_terms: D000375:Aging; D000818:Animals; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D011388:Prolactin / Q000097:blood; D051381:Rats; D011919:Rats, Inbred Strains; D012726:Sexual Behavior, Animal / Q000502:physiology*; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D011388:Prolactin; D007986:Luteinizing Hormone