title: Annual gonadotropin and testosterone cycles in free-living male birds.
mesh_terms: D000818:Animals; D000835:Animals, Wild; D001717:Birds / Q000502:physiology*; D005640:Follicle Stimulating Hormone / Q000097:blood*; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D010507:Periodicity; D012098:Reproduction; D012621:Seasons; D013045:Species Specificity; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone