Jafari Shoja, Razzagzadeh Sarain
Young Researchers and Elite Club, Maku Branch, Islamic Azad University, Maku, Iran.
West Azerbaijan Agriculture and Natural Resource Research Center, Urmia, Iran.
Trop Anim Health Prod. 2016 Mar;48(3):667-72. doi: 10.1007/s11250-015-0987-0. Epub 2016 Jan 6.
Genetic parameter estimates of growth rates, Kleiber ratios, and fat-tail dimensions were aimed using 22, 253 records at the present study. The studied traits were average daily gain from birth to weaning, average daily gain from 9 months of age to yearling, Kleiber ratio from birth to weaning, Kleiber ratio from 9 months of age to yearling, fat-tail length, fat-tail width, and fat-tail thickness. Each trait was fitted by four different animal models, which are differentiated by including or excluding maternal effects. Beside the estimates of genetic and phenotypic correlation among the studied traits, the association of them with birth to yearling live body weights using series of bivariate animal models was investigated. The direct heritabilities were ranged from 0.04 to 0.20, which indicated a wide range of additive genetic variances of the traits. Genetic and phenotypic correlations between the main traits were ranged from -0.11 to 0.99 and -0.08 to 0.95, respectively. The results indicated that the traits could be improved by including them in the selection index due to their moderate to high heritability estimation.
本研究使用22253条记录对生长速率、克莱伯比率和肥尾尺寸进行了遗传参数估计。所研究的性状包括从出生到断奶的平均日增重、从9月龄到周岁的平均日增重、从出生到断奶的克莱伯比率、从9月龄到周岁的克莱伯比率、肥尾长度、肥尾宽度和肥尾厚度。每个性状都采用四种不同的动物模型进行拟合，这些模型通过包含或排除母体效应来区分。除了估计所研究性状之间的遗传和表型相关性外，还使用一系列双变量动物模型研究了它们与出生到周岁活体重的关联。直接遗传力范围为0.04至0.20，这表明这些性状的加性遗传方差范围较广。主要性状之间的遗传和表型相关性分别为-0.11至0.99和-0.08至0.95。结果表明，由于这些性状的遗传力估计为中度到高度，因此将它们纳入选择指数可以对其进行改良。
