A metabolism trial was carried out with the objective to determine the chemical composition and energetic values of different feeds for poultry. Two hundred and forty five females chickens, 21 days old were used. The total excreta collection method was used and the feeds studied were: meat and bone meal (three samples) and poultry viscera meal. The values of nitrogen-correct apparent metabolizing energy, as fed basis, were 2.048±0.07kcal/kg for meat and bone meal 1; 1.565±0.13kcal/kg for meat and bone meal 2; 2.119±0.08kcal/kg for meat and bone meal 3 and 3.636±0.04kcal/kg for poultry viscera meal.