10日龄肉鸡和蛋鸡血清甲状腺激素和胰岛素水平的比较

COMPARISON OF PLASMA THYROXIN AND INSULIN CONCENTRATIONS BETWEEN 10 DAY OLD LAYER AND BROILER CHICKENS

本实验应用放射免疫分析法，对孵化后１０日龄的肉鸡和蛋鸡血清中三碘甲腺原氨酸（Ｔ３）和甲状腺素（Ｔ４）及胰岛素（Ｉｎｓｕｌｉｎ）水平进行测定。结果如下：在不同品种间，肉鸡的Ｔ３血清浓度显著高于蛋鸡（Ｐ＜０．０１）。尤以雄性间差异更为显著（Ｐ＜０．００１）；Ｉｎｓｕｌｉｎ水平也出现品种间差异，雄性肉鸡显著高于雄性蛋鸡（Ｐ＜０．０１）。在不同性别间，雌性蛋鸡的Ｔ３和Ｉｎｓｕｌｉｎ水平显著高于雄性蛋鸡（Ｐ＜０．０５），而肉鸡两性别间无明显差异。Ｔ４水平在两品种与两性别间均无明显差异。另外，Ｔ３和Ｉｎｓｕｌｉｎ水平与蛋鸡及雄性肉鸡的个体增重间均呈现明显相关关系（Ｐ＜０．０５）。提示：血中Ｔ３。

In this study both sexes of 10 day old layer and broiler chickens were used to investigate plasma circulating concentrations of 3,3' 5 triiodothyronine(T 3),thyroxine(T 4)and insulin by using the radioimmunoassay(RIA)methods The results were as follows: serum T 3 concentration was higher in broilers than that in layers( P <0 01),especially a significant difference between male strains was seen in this experiment( P <0 001),and the levels of plasma insulin was significantly higher in male broilers than that in male layers( P <0 001),however,no clear differences in plasma T 4 was seen between strains and sexes( P >0 05) In addition, there were sex differences in T 3 and insulin levels in layers,that is to say,those in the female layers was higher than those in the male layers,but no clear deifference was seen between sexes in broilers A significant positive correlation between T 3, insulin and their weight gained ( P <0 05) The results suggest that the levels of serum T 3 and Insulin may influence the various growth rate during early posthatch development in layers and broilers