This study was conducted to evaluate the effects of formulateddiet based on nitrogen-corrected apparent and true metabolizable energy (AME_n, TME_n), total and digestible amino acid of feedstuff on broiler performance and carcass characteristics of Ross 308 broiler chickens. This experiment was carried out as 2×2 factorial arrangement with compeletely randomized desing Main factors including method of formulating diet based on total and digestible amino acid and based on apparent and true metabolizable energy of feedstuff. A total of 400 one day-old chicks were randomly assigned to 4 treatments with 5 replicates and 20 chicks per replicate. Experimental parameters for periods of 1-21, 22-42 and 1-42 days were measured. The results showed that the body weight gain and feed intake increased significantly when the chicks were fed with diet based on AME_n and digestible amino acid in whole periods of experimen (p<0.05). Feed conversion ratio significantly decreased in chicks fed with diet based on AME_n and digestible amino acid during 1-21 and 1-42 days of age. Dietary treatments had significant effect on breast and thigh yield, but had not significant effect on carcass carocteristics (p>0.05). The results obtained in the present study demonstrated that formulation of diets based on AME_n and digestible amino acid improved performance of Ross 308 broiler chicks.

Keywords: AMEn, TMEn, Total amino acid, Digestible amino acid, Broiler, Performance

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