隐性白羽鸡体重生长规律的研究

Study on Growth Regularity about Body Weight of Recessive White Chicken

以两种代谢能、三种粗蛋白水平组成的6种日粮饲喂7～12周龄隐性白羽鸡,个体测定各周龄体重,进行生长分析,旨在研究有关因素对体重的影响。研究结果表明:①性别对2～12周龄体重、成熟体重估计值、初生重估计值、生长高峰周龄、高峰体重有极显著影响(P<0.01),均表现为公鸡大于母鸡,对生长速率参数的影响显著(P<0.05),表现为母鸡大于公鸡;②日粮能量对12周龄体重和生长速度参数有显著影响(P<0.05);③日粮蛋白对8～12各周龄体重、成熟体重估计值、高峰体重有显著影响(P<0.05);④1～6周龄体重遗传力为0.43～0.57,7～12周龄遗传模型1(0.37～0.67)比遗传模型2(0.33～0.58)估计的体重遗传力要高,成熟体重估计值、初生重估计值、生长速率参数、生长高峰周龄、高峰体重的遗传力分别为0.1、0.39、0.15、0.33、0.04。

Six different feed rations constituted by two metaboliazble energy （ME） and three crude protin （CP） level were fed to recessive white chicken （RWC）at 7-12 weeks.The boby weights （BW）every week were measured and analyzed.The aim of this paper is to study the effects of relevant factors on BW.The results showed that： ①The effects of sex on BW at 2-12 weeks,estimated mature weight,estimated birth weight,week age in growth peak,peak BW are extremely significant （P〈0.01）,and effects on growth rate parameter are significant （P〈0.05）;②ME level has significant effects on BW at 12 weeks and growth rate parameter. ③CP level has the significant effects on BW at 8-12 weeks,estimated mature BW,peak BW （P〈0.05）;④Heritability of BW at 1-6 weeks are 0.43-0.57,when in 7-12 weeks,the heritability estimated by genetic Model l（0.37-0.67）higher than that estimated by genetic model 2（0.33-0.58）.The heritability of estimated mature BW,estimated birth weight,growth rate parameter,week age in growth peak and BW in growth peak are 0.1,0.39,0.15,0.33,and 0.04 respectively.