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An experiment was carried out for six weeks, in arid zone of Rajasthan. A total of 180 day old broiler chicks were divided into four treatment groups of 45 chicks which were further sub-divided into three equal replicates. The designation used in the present study were T1, control group without any supplementation. T2, T3 and T4 groups were supplemented with Black cumin seed, Black pepper and dry Tulsi leaves, respectively @ 300 g/ton of feed each.The average body weight was found to be significant in all the six weeks. Weight gain was found to be highly significant in week I, II, III, IV and VI. The average feed consumption was found to be significant in all the weeks. The effect of Black cumin seed, Black pepper and dry Tulsi leaves on feed conversion efficiency were highly significant (P