The need to provide protein at a low cost to consumers in Nigeria, has stimulated continued search for more suitable combination of known nutrients, and for new additives which will increase the efficiency and growth rate and therefore level of production of poultry birds. These widespread efforts have led to the present use of growth promoters (variously called growth permitters, growth enhancers, biostimulators). Growth promoters are antimicrobials, synthetic agents or mixtures of these. They directly or indirectly enhance digestion and hence anabolism. They remove pathological conditions and therefore cause growth promotion. This study reports the use of one of such commercial growth promoters recently introduced into the poultry market in Nigeria on the performance of broilers