The Effects of Different Systems of Expressing Metabolizable Energy and Amino Acid of Diet, on Performance and Carcass Characteristics of Broiler Chicks

This study was conducted to evaluate the effects of formulated diet based on nitrogen-corrected apparent and true metabolizable energy (AMEn, TMEn), 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 AMEn and digestible amino acid in whole periods of experimen (p<0.05). Feed conversion ratio significantly decreased in chicks fed with diet based on AMEn 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 AMEn and digestible amino acid improved performance of Ross 308 broiler chicks.