Abstract: The study in the text was carried out in broiler chickens to investigate the inclusion of black pepper (Piper nigrum) and coriander (Coriandrum sativum) at graded levels (0.5%, 1.0% and 1.5% black pepper; 1.0%, 2.0% and 3.0% coriander) either alone or in combination as an alternative to body weight (g). A 42-day feeding trial followed by a metabolic trial was conducted under standard feeding and management conditions on 360 day-old Vencobb broiler chickens randomly divided into 10 treatment groups (T1-T10) with three replicates of 12 chickens each. Feeding was done according to 'ICAR (2013) standards. The total mean daily gain in treatment groups T1 (control), T2, T3, T4, T5, T6, T7, T8, T9 and T10 were recorded as 51.83, 52.15, 58.51, 57.73, 54, 68, 59.30, 55.75, 55 54.88, 54.52 g, respectively. Statistical analysis of the data revealed a highly significant (p<0.01) effect of black pepper and coriander administration in II. to VI. week and a significant (p<0.05) effect in week I.