A 56-day trial was conducted on 140 day-old broiler chicks fed graded levels of Alphamune G (0.00, 0.02, 0.03, 0.04, 0.05 and 0.06%) in a completely randomized design. Feed intake and weight gain were significantly influenced (P<0.05) by the inclusion levels of Alphamune G. Bird fed 0.00% and 0.02% Alphamune had the highest and lowest feed intake, respectively. There was no significant difference in the feed intake, weight gain and feed to gain ratio of broiler birds fed 0.04 and 0.05% Alphamune G. Birds fed Alphamune at 0.04 and 0.05% had the best feed to gain ratio. Broiler chicks fed 0.04% of Alphamune G had the highest fibre, fat and ash retention (68.70, 77.46, and 59.88%, respectively). There was no significant difference (P>0.05) in the carcass characteristics of birds fed different graded levels of Alphamune G. Haematological parameters show no significant difference among levels of Alphamune G. Serum biochemical values did not show any significant effect except for cholesterol, creatinine and uric acid. Alphamune G at 0.04% inclusion in diets may help improve performance of broiler chicken.