Genetic divergence among Hariana crosses with exotic dairy breeds

This study was undertaken to estimate the genetic divergence among 1/2 Frie sian + 1/2 Hariana(FH), 1/2 Friesian + 1/4 Brown Swiss + 1/4 Hariana (FBH) and 1/2 Friesian + 1/4 Jersey + 1/4 Hariana (FJH) crossbreds, on the basis of first lactation and lifetime traits. Data on 227 FH, 187 FBH and 197 FJH crossbreds from the institute herd during 1976 and 1994 were used to study genetic divergence among 3 genetic groups. The traits included were age at first calving (AFC), first lactation milk yield (FLMY), first peak yield ( FPY), first dry period (FDM), first calving interval (FCI), lifetime milk y ield (LTMY) and herd life (HL). Only DH-FJH combination showed significant differences for the D-2 value, based on first lactation and lifetime traits . The FBH genetic group did not differ significantly from FH and FJH. Three genetic groups had formed individual clusters. The total D2 values contrib uted by all the 7 traits is 0.61. The percentage contribution of LTMY to th e total D-2 value was the maximum (36.31%) followed by FLMY (17.71%), FPY ( 16.08%) and AFC (14.72%).