title: The roles of day length and the testes in the regulation of plasma LH levels in photosensitive and photorefractory willow ptarmigan (Lagopus lagopus lagopus).
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D002369:Castration; D008027:Light; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D010507:Periodicity; D012621:Seasons
chemical_list: D007986:Luteinizing Hormone