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Abstract
The present study was carried out on two herds in two farms, Sakha and El karada where in kafrelshikh governorate which belong to
Animal Production Research Institute –Agriculture Research center-
Agriculture Ministry. This study carried out on 854 lactating Friesian
cows which were daughters of 104 sires and 689 dams. 2940 records
collected from cows data concluded the period from 1984 to 2008