title: Plasma testosterone in bulls. Seasonal variation.
mesh_terms: D000818:Animals; D002417:Cattle / Q000097:blood*; D002940:Circadian Rhythm; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D012621:Seasons; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D007986:Luteinizing Hormone