Comparative Performance Between Imported and Local Born Holstein Friesian Cows Maintained at a Commercial Farm in Egypt

Abstract

Least squares analysis of variance showed significant on month of calving, year of calving and parity on all traits studied (p<0.05 or p<0.01) except for the effect of year of calving on lactation period. The effect of group was significant on DP and DO (p<0.05 or p<0.01). The effect of sire was significant on 305 day milk yield and heritability estimates was 0.203±0.064. The present results show that local born are produced less milk and smaller LP, DP, DO and CI than their imported dams. Then it is adapt Holstein Friesian in Tropical countries. Improving the management in the farm may result in better performance especially in reproductive traits.