ResultsDried leaves of peppermint have been analyzed for chemical composition and CP content of peppermint samples was176 g/kg of dry matter. Incremental levels of peppermint were substituted for rice hull in the basal diet, therefore, CP contentof experimental diets varied from 0.176 to 0.704% of diet. This negligible variation would be considered as safety of marginwithout affecting the results.The FI, BW gain, and FCR data are given in Table 3. The effects of dietary peppermint on performance were not significantin different age classes. During 7–35 days of age, BW gain was remained constant among experimental treatments whereasFI showed incremental trend (P = 0.099) resulting in impairing FCR with inclusion of peppermint in the diet (P = 0.062).The effects of dietary peppermint on carcass attributes were not significant (Table 4). However, carcass percent showed a