Investigation of the Genetic and Phenotypic Potential of Productive Traits Using the Uni and Multiple Traits Animal Model in River Buffalo
The main objective of this study was to estimate genetic and phenotypic potential of milk yield, fat yield and fat percentage traits. Data analyzed were 3350 records from buffalo during 1989-2008 were collected. Co-variance components were estimated using uni and multiple traits of animal model with the Restricted Maximum Likelihood method. In this method with constant effects of season-city-year and lactation period and additive genetic was taking as Random effect. The mean and standard deviation for milk yield, fat yield and fat percentage were 964.14±18.28, 52.35±1.88 and 5.58±0.03, respectively. The heritability of milk yield, fat yield and fat percentage were 0.22, 0.18 and 0.13, respectively using univariate model. The repeatability of milk yield, fat yield and fat percentage were 0.55, 0.41 and 0.39, respectively using univariate model. The genetic and phenotypic correlation between milk yield-fat percentage, milk yield-fat yield, fat yield-fat percentage was -0.25 and -0.30, 0.75 and 0.25, 0.29 and 0.41, respectively. The heritability for milk yield trait was moderate, so selection on the basis of this trait may cause a desirable genetic gain.