4～6周龄肉仔鸡日粮中苏氨酸的需要量

将210只体重相近的21龄健康AA肉公雏随机分为5组,每组6个重复,每重复7只鸡,分别饲喂以可消化氨基酸为基础配制的苏氨酸水平分别为4.9,5.5,6.1,6.4和6.7 g/kg的日粮,探讨不同苏氨酸水平对肉仔鸡生长性能、血清生理生化指标和免疫机能的影响,以确定4~6周龄肉仔鸡日粮中苏氨酸的需要量。结果表明,日粮苏氨酸水平显著影响肉仔鸡增重速度和饲料转化率,以生长性能为指标确定的苏氨酸水平为6.1 g/kg,T hr/Lys为70/100;超量添加苏氨酸可显著提高肉仔鸡的细胞和体液免疫功能。

Dietary threonine requirement for broilers at 4 to 6 weeks

In recent years,the international banks had made a great progress in the scope of credit risk management,and had established many advanced metric models.On the foundation of analysis and evaluation to these models,this paper points out that it is very pivotal for establishing the modern risk model and the management technology of credit risk in China to design the model frame and the parameter systems,and to build up the united data warehouse and the management information systems at the same time,according to the actual condition of China and the present situation of state-owned commercial banks.