title: Gonadotropin binding and testicular function in old rats.
abstract: Serum testosterone levels, testicular LH binding and the spermatogenic cycle were analyzed in rats 4 and 22 mo of age. With age, serum testosterone levels decreased from 3.2 to 0.63 ng/ml serum. There was no age related decline in testicular LH binding or changes in the spermatogenic cycle.
mesh_terms: D000375:Aging; D000818:Animals; D008297:Male; D051381:Rats; D011956:Receptors, Cell Surface / Q000378:metabolism*; D013094:Spermatozoa / Q000502:physiology; D013737:Testis / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D013739:Testosterone / Q000097:blood
chemical_list: D011956:Receptors, Cell Surface; D013739:Testosterone