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Comparison of Ileal Endogenous Amino Acid Flows in Broiler Chicks and Turkey Poults¹

S. A. Adedokun^*, C. M. Parsons, M. S. Lilburn, O. Adeola^* and T. J. Applegate^*,2

^* Department of Animal Sciences, Purdue University, West Lafayette, IN 47907; Department of Animal Sciences, University of Illinois, Urbana-Champaign 61801; and Department of Animal Sciences, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster 44691

² Corresponding author: applegt{at}purdue.edu

Ileal endogenous amino acid (IEAA) and total amino acid (TAA) flow (mg/kg of DM intake) in turkey poults and broiler chicks at 3 ages (5, 15, and 21 d) were compared by feeding a N-free diet (NFD) or graded levels of casein (highly digestible protein, HDP). The semipurified diets contained 0 (NFD), 50, 100, or 150 g of casein/kg of diet as the only source of amino acids. Each diet was fed to 6 replicate cages containing 30 (5 d), 10 (15 d), or 8 (21 d) birds per cage for 5 d prior to the collection of ileal digesta. At d 5, IEAA and TAA flow in poults fed the NFD, 50, and 100 g of casein/kg of diet was higher (P < 0.05) than in chicks. The IEAA flows within and between both species on d 15 and 21 were not different. Similar trends were observed for the HDP diets (50, 100, or 150 g of casein/kg of diet). An interaction (P < 0.05) between species and age was observed for most of the amino acids for all treatments. The results from this study suggest that at d 5, poults have significantly higher concentration of IEAA and TAA output relative to chicks. However, by d 15 and 21, there were no species differences in IEAA or TAA flow. These results also showed that IEAA flow is species and age dependent. The increased IEAA flow observed at d 5 should be taken into consideration when formulating starter diets on a digestible amino acid basis.

Key Words: broiler chick • casein • ileal endogenous amino acid • nitrogen-free diet • turkey poult

¹ Journal paper number 2006-17946 of the Purdue University Agricultural Research Programs.

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