This study was conducted to determine the infl uence of feeding supplemental fat on the milk production and its composition in four primiparious Sahiwal cows. Animals were randomly assigned to receive one of four diets containing 0, 2, 4 and 6 % levels of animal fat (tallow), respectively. All the diet s were madeisonitrous and isocaloric and fed for four periods each of 21 days duration, including 21 days as adjustment period. The cows were housed individually in a tie stall barn and fed ad libitumthe total mixed ration (TMR).Drymatter (DM) intake d ecreasedlinearly(P> 0.01) with increasing level of tallow in the diet. Dailyintake of organic matter was significantly l ower (P> 0.05) in cows fed different levels of tallow as compared to control diet; however there was no significant difference (P>0.0 5) between cows fed diets containing 2% tallow and control.cost per kg of milk from cows fed control diet was lower than the other diets. Costs were similar between the 2 and 4 % tallow supplemented groups while production cost per cow was higher (P>0.01) for cows fed diet containing 6% tallow. The income from m ilk produced increased quadrata lly (P<0.01) with increasing level of tallow. Thestudy inferred that tallow is an economical source of energy for supplementation up to 4 % level of the di et dry matter in Sahiwal cows. Keyw ords:Dairying, Fatfeeding, Economics, Sahiwal cowsPakistan.