Estimates of Phenotypic Correlation Between External and Internal Egg Quality Traits in Gramapriya, Vanaraja and their Crosses

Abstract

The present study was carried out with total of 211 eggs with more than 50 eggs from each genetic groups namely Gramapriya × Gramapriya (GP × GP), Vanaraja × Vanaraja (VR × VR), Vanaraja × Gramapriya (VR × GP) and Gramapriya × Vanaraja (GP × VR) to examine the phenotypic correlation between different egg quality traits in different genetic groups. The estimates of phenotypic correlation between egg weight and all the egg quality traits were highly significant (P<0.01), positive and very high in magnitude except the correlation with shape index and yolk index in the VR × GP genetic group. Also in GP × VR genetic group the estimates of phenotypic correlation between egg weight and all the egg quality traits were highly significant (P<0.01), positive and very high in magnitude except with yolk index and yolk height. Highly significant (P<0.01) correlations were observed among the various egg quality traits, except the correlation between egg length and shape index and between yolk width and yolk index where magnitudes were though high and significant but negative in direction. The estimate of correlation in VR × GP cross was positive in general, and highly significant in comparison to other genetic groups.