title: Comparison of ileal endogenous amino acid flows in broiler chicks and turkey poults.
abstract: 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.
authors.affiliation: Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Adedokun
authors.forename: C M
authors.initials: CM
authors.lastname: Parsons
authors.forename: M S
authors.initials: MS
authors.lastname: Lilburn
authors.forename: O
authors.initials: O
authors.lastname: Adeola
authors.forename: T J
authors.initials: TJ
authors.lastname: Applegate
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000378:metabolism*; D004032:Diet / Q000662:veterinary; D004305:Dose-Response Relationship, Drug; D005766:Gastrointestinal Contents / Q000737:chemistry; D007082:Ileum / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D013045:Species Specificity; D014422:Turkeys / Q000378:metabolism*
chemical_list: D000596:Amino Acids