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Aims: This study is to evaluate the effects of high level methionine or lysine supplementation on the performance and carcass characteristics of broilers fed low crude protein diets. Study Design: The experiment employed a complete randomized design; all data generated were subjected to analysis of variance. Place and Duration of Study: The experiment was carried out at the Teaching and Research Farm of the University of Ibadan, Nigeria between April and July 2011. Methodology: One hundred and ninety two unsexed day old broiler chicks were used in a six-week feeding trial. For each study four experimental diets were formulated such that they contained methionine at four dietary levels of 0.0%, 0.35%, 0.45% and 0.55% while the other four set contained lysine at four dietary levels of 0.0%, 0.60%, 0.70% and 0.80% respectively. The crude protein (CP) levels of T1-T4 in methionine or lysine diets are 24.25%, 19.70%, 15.15% and 10.60%. Results: Results indicated that broilers fed diet 1 with normal protein level without methionine and lysine had higher (P |
