[Course of thyroxinemia during the development of the chick embryo. Influence of hypophysectomy].
Plasma thyroxine (T4) level of intact and hypophysectomized Chick embryos has been determined for the incubation interval 10 to 18 days. T4, which is the main circulating thyroid hormone, exists as early as day 10. The plasma T4 level of controls increases as power function of time from day 10 to day 17. Hypophysectomy (on day 2) produces a decrease of the plasma T4 level, but only from day 11, which accounts for the beginning of a pituitary control of the thyroid secretion after day 10.
D000818:Animals; D002642:Chick Embryo / Q000502:physiology*; D007016:Hypophysectomy; D010902:Pituitary Gland / Q000502:physiology*; D011863:Radioimmunoassay; D013974:Thyroxine / Q000097:blood*; D013997:Time Factors
D013974:Thyroxine
Evolution de la thyroxinémie au cours du développement de l'embryon de Poulet. Influence de l'hophysectomie