title: Effect of season and pregnancy on total plasma thyroxine concentrations in sheep.
mesh_terms: D000818:Animals; D005260:Female; D008722:Methods; D011247:Pregnancy; D011270:Pregnancy, Animal; D012621:Seasons; D012756:Sheep / Q000502:physiology*; D013696:Temperature; D013974:Thyroxine / Q000097:blood*
chemical_list: D013974:Thyroxine