title: A comparative study of the annual cycles in sexual and thyroid function in male Peking ducks (Anas platyrhynchos) and teal (Anas crecca).
mesh_terms: D000818:Animals; D001717:Birds; D004372:Ducks; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D009929:Organ Size; D010507:Periodicity; D012621:Seasons; D012726:Sexual Behavior, Animal; D013045:Species Specificity; D013737:Testis / Q000502:physiology*; D013739:Testosterone / Q000097:blood*; D013961:Thyroid Gland / Q000502:physiology*; D013974:Thyroxine / Q000097:blood*
chemical_list: D013739:Testosterone; D007986:Luteinizing Hormone; D013974:Thyroxine