title: The effects of castration on the seasonal pattern of plasma LH concentrations in wild mallard drakes.
mesh_terms: D000818:Animals; D002369:Castration; D004372:Ducks / Q000502:physiology*; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D012621:Seasons; D013737:Testis / Q000502:physiology*
chemical_list: D007986:Luteinizing Hormone