title: The annual cycle in luteinizing hormone in the plasma of intact and castrated white-crowned sparrows, Zonotrichia leucophrys gambelii.
mesh_terms: D000818:Animals; D001683:Biological Clocks; D001717:Birds / Q000097:blood*; D002369:Castration; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D012621:Seasons
chemical_list: D007986:Luteinizing Hormone