The relative growth rate of poultry birds in terms of weight (in grams) with respect to different diet composition. (A) Growth rate of birds when feeded with diet D1 (BD+1% of Black pepper); D2 (BD+1% of Turmeric); D3 (BD 1% of Fennel). (B) Growth rate of birds when feeded with diet D4 (BD+ 0.5% of Black pepper+ 0.5% of Turmeric); D5 (BD+0.5% of Black pepper+0.5% of fennel); D6 (BD+0.5% of Turmeric+ 0.5% of fennel). *BP: black pepper; T: Turmeric; F: Fennel.