In order to evaluate the effect of feeding different levels of wheat bran on fattening performance as well as carcass characteristics, an experiment was conducted on fifteen Baluchi male lambs. The experiment was done using three treatments with five replicates each. in completely randomized design manner.The treatments consisting 10, 20 and 30% wheat bran. In the last two treatments, wheat bran was substitute with barley and corn. The experiment was run for 90 days. The results indicated that carcass componentsas well as, average daily gain, final live weight and feed conversion ratio were not affected by the treatments. Feed intake as well as nutrient consumption were not significantly affected by the treatments. Wheat bran consumption was affected by the treatments significantly (P<0.05). Although pH was not significantly affected by the treatments, ammonia nitrogen concentration was different among the treatments (P<0.05) and increased as wheat bran percentage increaded. It can be therefore concluded that levels higher than 30% DM of wheat bran could be used in replace of cereals.