The performance of broilers (0-6 weeks) supplemented with carbohydrase grew better and had a better feed efficiency ratio (FER) . Supplementation of multicarbohydrase to marginally deficient in energy diet improved performance of broilers and retention of protein and fat. However, supplementation of mannanase had showed no significant effect on performance of broilers. Supplementation of multicarbohydrase in broiler diets had shown significant increase in carcass yields by reducing processing losses. Thus, energy level can be reduced in broiler diet (by 100kcal ME/kg) than standard while supplementing their diets with multicarbohydrase without any adverse effect on birds for economical broiler production. It is concluded, that multicarbohydrase (Xylanase @50 g/ton + Mannanase @50 g/ton + Amylase @40 g/ton) supplementation had improved overall performance of broilers as well as digestibility of crude protein in low energy diets.