Comparison of Thyroid Hormones Levels in Duck Blood and Embryonic

The levels of thyroid hormones(T3,T4 and FT3) in female duck serum,fertilized eggs,and 7,11,15,19,22,28-days embryonics of Gaoyou duck and Jinding Duck were analyzed with radioimmunoassay(RIA).The levels of thyroid hormones in fertilized eggs were higher than those in the duck serum.Meanwhile,the levels of thyroid hormones in serum of different ages had almost the same variation trend,which went down after 15 days.The results suggested that thyroid hormones played an important role in early embryonic development of duck.