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The present study was carried on a data consisting of 855 body weights at different ages of 345 Nili Ravi buffalo heifers from 281 dams and sired by 39 sires maintained at the Livestock Development Research Center,Raroo,Muzaffarabad,Azad Kashmir,Pakistan from 1989 to 2008 and analyzed by using DFREML (Derivative Free Restricted Maximum Likelihood).