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Poultry and Laboratory Animal Nutrition
Asian-Australasian Journal of Animal Sciences 2011;24(5): 650-654.
DOI: https://doi.org/10.5713/ajas.2011.90293    Published online April 27, 2011.
Effects of Levels of L-Leucine Supplementation with Sub-optimal Protein in the Diet of Grower-finisher Broiler Chickens on Carcass Composition and Sensory Characteristics
E. Erwan, A. R. Alimon, A. Q. Sazili, H. Yaakub, R. Karim
An experiment involving 180 straight run one-day-Cobb broilers was conducted to evaluate the effect of supplementation of L-leucine with different levels of crude protein (CP) on carcass composition and sensory characteristics of broiler grower-finisher chickens. Six experimental diets comprising two levels of crude protein (CP) i.e., 20 and 20% with three levels of L-leucine i.e. 0, 0.5 and 0.67%, were offered to birds from 21-42 d of age. The birds were randomly divided into 36 experimental pens, 5 chickens in each pen, and there were 6 replicates under each diet. L-leucine supplementation did not affect the bone and lean, whereas fat was decreased (p<0.05) when L-leucine was added at 0.5%. Similarly, there were no significant differences (p>0.05) in the lean, fat and bone among chickens fed two levels of CP. No significant differences between dietary treatments were observed on any sensory characteristics affected by dietary L-leucine and CP. From this study, it is obvious that supplementation of up to 0.5% L-leucine reduced fat. However, other characteristics were not affected by supplementation of L-leucine. Similarly, reduction of body composition and sensory characteristics were not apparent on a diet low in CP.
Keywords: L-leucine; Crude Protein; Broiler; Carcass Composition; Sensory Characteristics

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