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Twenty four lactating Jaffrabadi buffaloes were randomized and blocked into four groups to receive commercial rumen bypass fat at 0, 10, 20 and 30 g/kg milk production besides meeting their nutrient requirements at ICAR 1985 feeding standards from calving to 180 day. All the buffaloes irrespective of group received bypass fat prior to calving 150 g day. Cost of feeding, cost of milk production, realizable receipts at farm and market prices were calculated and analyzed. Daily feed costs (Rs/head) in T1, T2, T3 and T4 were 96.56±3.80, 111.09±4.23, 106.61±4.58 and 117.47±4.76 respectively and it was statistically lower (P<0.05) in control than those in T2, T3 and T4 which were at par. Daily realizable receipts from sale of milk (Rs/head/day) on prevailing from price and on local market price were 128.58±8.86, 159.21±13.39, 122.94±11.27 and 140.97±7.29 and 205.73±14.17, 254.73±21.58, 196.71±18.03 and 225.54±11.67, respectively. Treatment groups did not differ significantly. Daily return over feed cost (Rs./Head) were 32.02±7.46, 48.12±9.90,16.33±7.51 and 23.49±3.35 on farm prevailing price and 109.17±12.48, 143.65±17.91, 90.09±14.13 and 108.07±7.45 on local market price for T1, T2, T3 and T4 group respectively. Costs of milk production (Rs./lit.) during the entire experiment period were 15.25±0.85, 14.30±0.84, 17.95±1.43 and 16.73±0.32 in T1, T2, T3, T4 group of buffaloes differences being non significant. This finding indicated that 10 g supplementation of commercial bypass fat per kg milk production has significant realizable benefit as compared to other levels of supplementation of bypass fat.