title: Plasma iodothyronines in the domestic fowl: newly hatched to early adult stages, with special reference to reverse triiodothyronine (rT3).
abstract: Circulating concentrations of thyroxine (T4), triiodothyronine (T3) and reverse triiodothyronine (rT3) were measured in chicks before, during, and after hatching, up to 9 weeks of age. T4 decreased prior to hatching, rose after emergence, and was variable in the immature domestic fowl. T3 increased prior to emergence, decreased until 5 days after hatching, and increased again by 1 week of age, after which the levels declined. Plasma rT3 declined prior to hatching, remained low until 5 days after emergence, and then increased, again, to 0.14-0.19 ng/ml between 1-9 weeks of age.
authors.forename: V W
authors.initials: VW
authors.lastname: Hylka
authors.forename: S A
authors.initials: SA
authors.lastname: Tonetta
authors.forename: R C
authors.initials: RC
authors.lastname: Thommes
mesh_terms: D000375:Aging; D000818:Animals; D002642:Chick Embryo; D002645:Chickens / Q000254:growth & development*; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*; D014285:Triiodothyronine, Reverse / Q000097:blood*
chemical_list: D014284:Triiodothyronine; D014285:Triiodothyronine, Reverse; D013974:Thyroxine