Abstract: A total of 144 day-old straight run Arbor Acres broiler chicks were fed on 4 iso-nitrogenous and iso-energetic diets; starter control contained 22.1% CP and 2924 Kcal/kg ME and finisher control had 19.25% CP and 3005 Kcal/kg ME. In three test diets exogenous Alquerzim (1g/kg), Roxazyme-G (0.01g/kg) and Feedzyme (0.05g/kg) were supplemented to control diet to observe whether addition exogenous enzyme improves efficiency of broiler production. The growth rate, feed intake, feed conversion, dressing yield and profitability were increased by addition of exogenous enzymes. The addition of enzyme is effective to overcome antinutritive effect of NSP on broiler performances. Enzyme had no effect on survivability. Roxazyme-G and Feedzyme are more profitable than Alquerzim. Therefore, it may be concluded that exogenous enzyme may be used in broiler diet by proper selection of enzyme to get best result.