title: Daily variation of corticosterone and thyroid hormones in broiler cockerels.
abstract: An experiment was conducted to monitor fluctuations in the major adrenal steroid, corticosterone (B), and two iodinated thyroid hormones, triiodothyronine (T3) and thyroxine (T4), over the course of a 24-hr day in broiler cockerels. A circadian variation was observed in B concentrations with the highest found at 0130 hr (23 hr light: 1 hr darkness; photophase beginning at 0100 hr). No circadian variation was observed for either T3 or T4.
mesh_terms: D000818:Animals; D002645:Chickens; D002940:Circadian Rhythm; D003345:Corticosterone / Q000097:blood*; D008297:Male; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D014284:Triiodothyronine; D013974:Thyroxine; D003345:Corticosterone