title: Diurnal variations in blood cortisol in the dairy cow.
abstract: Concentrations of adrenal corticosteroids in plasma were determined by a competitive protein-binding technique in blood samples taken hourly over 24 h from four dairy cows, each sampled for three 24 h periods. Mean blood cortisol was 7.9 ng/ml. Statistical analysis revealed no diurnal variation. Reasons for this are postulated.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D002417:Cattle / Q000097:blood*; D002940:Circadian Rhythm; D005260:Female; D006854:Hydrocortisone / Q000097:blood*; D008722:Methods; D011247:Pregnancy; D011485:Protein Binding
chemical_list: D006854:Hydrocortisone