title: Diurnal variation in plasma cortisol levels in sheep.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D002940:Circadian Rhythm; D003624:Darkness; D005260:Female; D006854:Hydrocortisone / Q000097:blood*; D008027:Light; D012756:Sheep / Q000502:physiology*
chemical_list: D006854:Hydrocortisone