Effect of Dietary Supplementation of Synthetic L-Lysine and DL-Methionine on Growth Performance, Nutrient Utilization and Immunity in Commercial Broiler Chicken

Abstract

An experiment was conducted to investigate the effect of synthetic L- lysine and DL-methionine on growth performance, nutrient utilization and humoral immunity in commercial broilers. 144 Day old broiler chicks (Vencobb 400) were randomly divided into four groups (3 replicates of 12 each) and basal diet supplemented with synthetic L-lysine @ 0, 20, 30 and 40% and DL-methionine @ 0, 30, 40 and 50% higher than BIS (2007) recommendation for 42 days. Supplementation of synthetic L-lysine and DL-methionine improved (P<0.001) final body weight and gain in weight at finisher phase as compared to control. The best feed conversion ratio (FCR) and protein efficiency ratio (PER) was observed in T₂ group supplemented with 20% lysine and 30% methionine. Higher (P<0.05) digestibility of crude protein and fibre and nitrogen retention was observed by supplementation of L-lysine and DL-methionine in broiler chicken. Supplementation of synthetic L- lysine and DL-methionine improved humoral immune response in the experimental birds with higher antibody titre.