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Pakistan Journal of Biological Sciences
Year: 1998  |  Volume: 1  |  Issue: 3  |  Page No.: 202 - 204

Genetic and Phenotypic (Co) variance for Yearling Weight and Post-weaning Growth Rate in Bhagnari×Droughtmaster Calves

M. S. Khan, M. Younas and M. A. Khan    

Abstract: Heritabilities of and correlations between yearling weight and post-weaning growth rate in Bhagnari and its crosses with Australian Droughtmaster cattle in Balochistan were estimated. Out of 1118 weaning weight observations with sire identification, only 136 had yearling weight recorded on them. The overall mean for the yearling weight was 151.5±38.9 kg while post-weaning growth rate averaged 261±56 gm. Heritability of the traits estimated by paternal half-sib correlation was 0.19±0.24 and 0.03±0.20, respectively. Very large standard errors reflected the scarcity of data points. Both the traits were highly positively correlated (0.72) due to the fact that the growth rate was derived from the yearling weight. The environmental correlation had a similar magnitude (0.67) but genetic correlation was unrealistic.

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