The aim of present study was to find out the effect of „challenge feeding‟ on performance and economics of milk yield of crossbred cows. Eighteen advance pregnant crossbred cows were selected 60 days before expected date of calving and were divided into 3 groups . control (T1), treatment (T2) and (T3) on the basis of milk yield, parity and body weight for this study. During the pre-partum period, animals of T1 control group were fed 1 kg concentrate for maintenance per day from 60th day to prior to calving till the day of parturition. | Effect of challenge feeding on calf birth weight and cow body weight gain
