Effect of different dietary protein levels and amino acid supplementation on performance and carcass composition of Lohmann Broiler chickens

A total of 325 day-old Lohmann broiler chicks were used in this study. The chicks were randomly divided into 13 equal groups, each of 25 chicks. It was planned that group 1 of chicks [controls], receive diets containing 22.9, 21.7 and 20% crude protein levels without amino acid supplementation during the starting, growing and finishing rearing periods. For the other groups, the dietary crude protein levels were reduced by 2 and 3% without or with L-lysine [0.05%] and /or DL-methionine [0.05%] supplementation during the same periods. Both feed and water were constantly available for 7 week-experimental period