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dc.contributor.authorSarsour, A. H.en
dc.contributor.authorLee, J. T.en
dc.contributor.authorHaydon, K.en
dc.contributor.authorPersia, M. E.en
dc.description.abstractAn experiment was conducted to evaluate the digestible tryptophan (Trp) requirement of laying hens from 22 to 34 wk of age. A total of 252 Hy-line W-36 laying hens were selected at 16 wk of age and allocated by weight (P = 0.90) to 7 dietary treatments resulting in 12 replicate cages of 3 birds for each treatment. A Trp-deficient basal diet was formulated using corn, corn gluten meal, and soybean meal for each of the 3 dietary phases and supplemented with synthetic L-Trp to provide 105, 119, 133, 147, 162, 176, and 190 mg digestible Trp on a daily basis over the experimental period. To adapt the hens to experimental diets, pullets were fed complete diets that contained increasing amounts of corn gluten meal. Hens received a controlled amount of feed daily based on feed intake expected under commercial conditions. Linear and quadratic brokenline, and quadratic polynomial models were used to estimate digestible Trp requirements based on hen-housed egg production (HHEP), egg mass (EM), and feed efficiency (FE). FE was calculated using EM and feed intake. Digestible Trp requirements were estimated to be 137, 183, and 192 mg/d for HHEP; 133, 180, and 183 for EM and 133, 177, and 173 for FE using linear brokenline, quadratic broken-line, and quadratic polynomial analysis, respectively. The quadratic broken line model in this experiment resulted in the best fit (R-2) for all parameters measured. Linear broken line estimates resulted in lower estimates that the other models, and HHEP resulted in higher estimated digestible Trp requirement than EM and FE.en
dc.description.sponsorshipCJ America Inc, USAen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs 4.0 Internationalen
dc.subjectdigestible tryptophanen
dc.subjectegg productionen
dc.subjectlaying henen
dc.titleTryptophan requirement of first-cycle commercial laying hens in peak egg productionen
dc.typeArticle - Refereeden
dc.contributor.departmentAnimal and Poultry Sciencesen
dc.description.notesThis experiment was financially supported by CJ America Inc, USA. Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by Virginia Tech, and does not imply approval to the exclusion of other products that may be suitable. Special thanks to Hy-Line international for providing the chicks, Elanco for SE vaccine, CJ for amino acids (lysine, methionine, tryptophan, isoleucine, and threonine) . The authors gratefully acknowledge the assistance of Dale Shumate, Kolby Foltz, Alicia Arne-son, Becky Tran, Alyssa Lyons, Siobhan Boothe (Virginia Tech, Blacksburg VA) for animal care and feed mixing assistance.en
dc.title.serialPoultry Scienceen

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Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International
License: Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International