Authors : V. Khaksar and A. Golian
Abstract: This study was conducted to compare the effect of feed formulation based on ileal digestible versus total amino acid on broiler performance. Two experimental diets formulated to meet nutrient requirements based on total amino acids (NRC) and/or recommended ileal digestible amino acids (Creswell and Swick). One hundred and twenty days old chicks were randomly assigned to 2 dietary treatments with 5 replicates of 12 chicks each. Body Weight Gain (BWG) and feed intake were recorded for periods of 1-21, 22-41, 42-47 and 1-47 days. Chicks were individually weighed on day 7, 21 and 47 to determine the group uniformity. Chromic oxide (0.3%) was used in diets to evaluate the passage time of feed through the gastrointestinal tract on day 16 and 32. At the end of experiment, 1 bird with the average pen weight from every pen was selected and slaughtered to measure carcass yield, breast, thigh and drum sticks, abdominal fat, gut, gizzard and ceca weights. The results showed that birds fed diet formulated on the digestible amino acid basis had higher BWG, breast yield and lower feed to gain ratio and abdominal fat pad than those fed diet on total amino acid basis. Transit time of feed was not affected by feed formulation, but increased as birds aged. Flock uniformity reduced over time and was not influenced by type of diet.
V. Khaksar and A. Golian , 2009. Comparisom of Ileal Digestible Versus Total Amino Acid Feed Formulation on Broiler Performance. Journal of Animal and Veterinary Advances, 8: 1308-1311.