4～6周龄肉仔鸡日粮中苏氨酸的需要量  

Dietary threonine requirement for broilers at 4 to 6 weeks

作　　者：王红梅[1] 陈玉林[1] 刘国华[2] 刘佳[3] 

机构地区：[1]西北农林科技大学动物科技学院,陕西杨凌712100 [2]中国农业科学研究院饲料研究所,北京100081 [3]河南信阳农业高等专科学校动物科学系,河南信阳464000

出　　处：《西北农林科技大学学报（自然科学版）》2006年第1期84-88,共5页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家"十五"科技攻关项目(2004BA514A13-9)

摘　　要：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6．7g／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，日粮苏氨酸水平显并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6．1g／kg，Thr／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鱼疫功能。The study aimed to investigate the effects of different dietary threonine （Thr） levels on the growth performance,serum physiological and biochemical parameters and immune function of broilers and to determine the requirement for dietary Thr for broilers at 4 to 6 weeks. Two hundred and ten 21 day aged AA broilers were randomly allocated to 5 dietary treatments with 6 replicates of 7 male chicks. Diets Thr were formulated on basis of digestible amino acids. Dietary threonine levels in the control and 5 treatment groups were 4.9,5.5,6. 1,6, 4 and 6.7 g/kg respectively. The results showed that broilers achieved the best growth performance （ADG,F/G） when dietary threonine leves was 6.1 g/kg （the ration of Thr ： Lys was 70 ： 100） in this study. The addition of Thr improved the growth performance and decreased feed/gain;immune function was significantly improved by diets Thr levels,and with the increase of the levels of Thr,the responses of immune system took on the trend of rise.

关 键 词：肉仔鸡 苏氨酸 生长性能 免疫机能 

分 类 号：S831.5[农业科学—畜牧学]