THE EFFECTS OF DILUDIN ON THE SERUM CONCENTRATION OF THYRONINE (T 3、T 4) AND CORTISOL IN LAYING CHICKENS
Li Chenghui,Zhang Xiangzhai,Wu Xianjun,Liu Yuzhi,Pang Xinwei (College of Animal Science and Technology,Agricultural University of Hebei,Baoding 071001)
In order to understand the effect of diludin on the growth of laying chickens and the mechanism of promoting growth,we carried out two trails.(1) 250 hisex breeding chickens(28d) were selected and divided into five groups.Diludin with different concentrations were added in each group’s feed.The result showed that Diludin could promote the growth of the chicken.The effect of 150 mg/kg group was the best among the groups.Up to 61 day feeding,the weight of 150 mg/kg group increased by 7.68% as compared with control group (P0 01).Up to 60 day feeding,the concentration of T 3 increased by 33.90% as compared to control group (P0 01).T 4 had the tendency of decrease.The secretion of cortisol was restrained.Up to 60 day feeding,its concentration decreased by 34.71% as compared with control group (P0 01) the average laying rate was above 50%,age at first laying was one week earlier than that in control group.(2) 5756 904 breeding chicken(7d) were selected and divided into two groups randomly.Diludin was added in the trail group’s feed with 150 mg/kg feed.The result showed that the weight and T 3 of trail group increased by 9.91%(P0.01) and 25.82%(P0 05) respectively as compared with control group.T 4 decreased by 21 91%(P0 05) as compared with control group.