author(s)
J Deka, JD Mahanta, KP Kalita, D Choudhury, HF Ahmed and S Tamuly

abstract
The present experiment was conducted to study the effect of supplementation of neem (Azadirachta indica) leaf powder (NLP) on the performance of commercial broiler chicken. A total of 144 day-old commercial broiler chicks (Cobb 400) were randomly divided into four groups viz. T₀ (only basal diet as control), T₁ (basal diet +0.1 % NLP), T₂ (basal diet +0.2 % NLP) and T₃ (basal diet +0.3 % NLP) consisting of 36 birds per group and further subdivided into 3 replicates of 12 chicks each. Supplementation of 0.3% Neem leaf powder improved the total feed consumption, significantly (P<0.05) improved final body weight and body weight gain. The final body weight per broiler was highest in T₃ group (2048.61 ± 24.27 g) followed by T₂ group (1939.64 ± 20.63 g), T₁ (1744.12 ± 45.71 g) and T₀ (1710.29 ± 38.32 g). At the end of the experimental period best FCR (1.75), highest BPEI (117.06) and higher gross profit was obtained in T₃ group among the different experimental groups.