Authors : Ali Hashemi and Mehdi Nayebpoor
Abstract: Heritability, repeatability and genetic phenotypic correlations among milk yield, fat yield and fat percentage were estimated using an animal model and 19855 records of 10225 Holstein-Friesian cows enrolled in the Iran, Natural Resources Research center of W. Azarbaijan, Urmia, between 1995 and 2005. Heritabilities for milk yield, fat yield and fat percentage were 0.26, 0.24 and 0.36, respectively and their repeatabilities were 0.31, 0.29 and 0.37, respetively. Genetic correlations of milk yield with fat yield and with fat percentage were 0.96 and -0.29, respectively and correlation of fat yield with fat percentage was -0.06. Phenotypic correlations were 0.96 between milk and fat yields, -0.27 between milk yield and fat percentage and -0.03between fat yield and percentage. It was concluded that these genetic and phenotypic parameter could be used for the genetic evaluation of dairy cattle in Iran.
Ali Hashemi and Mehdi Nayebpoor , 2008. Estimates of Genetic and Phenotype Parameters for Milk Production in Iran Holstein-Friesian Cows. Research Journal of Biological Sciences, 3: 678-682.