title: Thyroid hormone changes in the bobwhite (Colinus virginianus) after hatching.
abstract: Total concentrations of thyroxine (T4) and triiodothyronine (T3) in plasma, and their biological half-lives were measured in adult and immature bobwhite. Concentrations of T4 and T3 decreased approximately 75% from Days 1 to 10 after hatching. After Day 10, the concentration of T4 did not significantly change as a function of age; however, the concentration of T3 doubled from Day 21 (275 ng/dl) to Day 29 (550 ng/dl) after hatching and remained significantly elevated above adult level (300 ng/dl) through Day 64. Changes in total concentration of T3 in plasma were not related to shifts in hormone utilization, as evidenced by biological half-life.
mesh_terms: D000367:Age Factors; D000818:Animals; D003088:Colinus / Q000097:blood*; D006207:Half-Life; D011784:Quail / Q000097:blood*; D012709:Serum Albumin / Q000378:metabolism; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D012709:Serum Albumin; D014284:Triiodothyronine; D013974:Thyroxine