A biological experiment was conducted by using 300 day-old, sex separated commercial broiler chicks belonging to single hatch. These chicks were randomly grouped into 6 treatments with 5 replicates of 10 chicks in each replicate with each replicate having equal number of male and female chicks. All the birds were reared under standard management practices in an environmentally controlled house up to five weeks of age. Experimental diets were prepared by adding tannin at 0, 0.05, 0.10, 0.15, and 0.20 per cent level, oxytetracycline at 0.02 per cent level in the basal broiler feed and basal diet alone fed to the broilers up to the end of the experimental period. Production parameters such as feed consumption and mortality were recorded at weekly interval and based on the collected data, feed conversion ratio and livability were worked out. At the end of the study period, two birds (one male and female) from each replicate were randomly selected and slaughtered to study the carcass characteristics. Dietary supplementation of tannin had no significant effect on the cumulative feed consumption and feed conversion ratio of broilers. At the end of fifth week, the antibiotic fed group recorded numerically higher body weight (T2 - 2063.06g) compared to other treatment groups. The tannin fed groups recorded numerically better feed conversion ratio (T3 - 1.49, T4 - 1.48 and T5 - 1.47) compared to antibiotic (T2 - 1.50) and control group (T1 - 1.53) except tannin at 0.2 per cent level (T6 - 1.52) which might be due to lower body weight gain due to reduction in feed intake. Supplementation of tannin in the diet of broilers had no significant influence on the livability, carcass characteristics viz. per cent eviscerated yield, ready-to-cook yield, heart yield, liver yield, gizzard yield, giblets yield and abdominal fat yield in broilers.