Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry
Summary: Two experiments were conducted to evaluate the effects of dietary amino acid density and exogenous protease inclusion on growth performance and amino acid digestibility in poultry. In experiment 1, Cobb 500 broiler chicks (n = 480) were fed to 21 d of age. Treatments were arranged as a 2 × ...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-06-01
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| Series: | Journal of Applied Poultry Research |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1056617121000118 |
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| author | C.N. Truelock H.K. Wecker C.J. Delfelder C.E. Evans R.A. Donadelli C.G. Aldrich M.A. Barrios C.R. Stark R.S. Beyer J.M. Gonzalez C.B. Paulk |
| author_facet | C.N. Truelock H.K. Wecker C.J. Delfelder C.E. Evans R.A. Donadelli C.G. Aldrich M.A. Barrios C.R. Stark R.S. Beyer J.M. Gonzalez C.B. Paulk |
| author_sort | C.N. Truelock |
| collection | DOAJ |
| description | Summary: Two experiments were conducted to evaluate the effects of dietary amino acid density and exogenous protease inclusion on growth performance and amino acid digestibility in poultry. In experiment 1, Cobb 500 broiler chicks (n = 480) were fed to 21 d of age. Treatments were arranged as a 2 × 4 factorial design with main effects of commercial protease (with or without) and amino acid density which corresponded to approximately 95, 97.5, 100, or 102.5% of breeder recommendations for digestible Lys. In experiment 2, hybrid turkey poults (n = 780) were fed diets formulated to provide low or adequate amino acid density (approximately 91 and 100% of the NRC-recommended requirement for digestible Lys, respectively) with each diet being fed with or without an exogenous protease. Poults received experimental diets from day 1 to 42 of age. Growth performance metrics were calculated from pen weights and feed consumption recorded throughout each experiment, and digestibility data were obtained from analysis of ileal contents. Data were analyzed using SAS 9.4 with pen as the experimental unit and pen location as the blocking factor. Results of these experiments demonstrated broilers fed 1.12 and 1.21% digestible Lys diets with added protease had a 2-point improvement in feed conversion ratio (FCR) compared with chicks fed these diets without protease. Increasing amino acid density improved FCR in broilers and poults and improved BW, ADG, and ADFI in poults. There was no evidence that added protease had an effect on BW, ADG, or ADFI in broilers or poults. Finally, ileal amino acid digestibility was not affected by amino acid density or protease inclusion for either 20-day-old broiler chicks or 42-day-old turkey poults. |
| first_indexed | 2024-12-16T13:03:37Z |
| format | Article |
| id | doaj.art-56fd4005128f42179078c4b47217d4ba |
| institution | Directory Open Access Journal |
| issn | 1056-6171 |
| language | English |
| last_indexed | 2024-12-16T13:03:37Z |
| publishDate | 2021-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Applied Poultry Research |
| spelling | doaj.art-56fd4005128f42179078c4b47217d4ba2022-12-21T22:30:46ZengElsevierJournal of Applied Poultry Research1056-61712021-06-01302100148Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultryC.N. Truelock0H.K. Wecker1C.J. Delfelder2C.E. Evans3R.A. Donadelli4C.G. Aldrich5M.A. Barrios6C.R. Stark7R.S. Beyer8J.M. Gonzalez9C.B. Paulk10Department of Grain Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USADepartment of Grain Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USADepartment of Animal Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USADepartment of Grain Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USADepartment of Grain Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USADepartment of Grain Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USAJefo, Saint-Hyacinthe, CanadaDepartment of Grain Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USADepartment of Animal Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USADepartment of Animal and Dairy Science, College of Agriculture, University of Georgia, Athens, GA, USADepartment of Grain Science and Industry, College of Agriculture, Kansas State University, Manhattan, KS, USA; Corresponding author:Summary: Two experiments were conducted to evaluate the effects of dietary amino acid density and exogenous protease inclusion on growth performance and amino acid digestibility in poultry. In experiment 1, Cobb 500 broiler chicks (n = 480) were fed to 21 d of age. Treatments were arranged as a 2 × 4 factorial design with main effects of commercial protease (with or without) and amino acid density which corresponded to approximately 95, 97.5, 100, or 102.5% of breeder recommendations for digestible Lys. In experiment 2, hybrid turkey poults (n = 780) were fed diets formulated to provide low or adequate amino acid density (approximately 91 and 100% of the NRC-recommended requirement for digestible Lys, respectively) with each diet being fed with or without an exogenous protease. Poults received experimental diets from day 1 to 42 of age. Growth performance metrics were calculated from pen weights and feed consumption recorded throughout each experiment, and digestibility data were obtained from analysis of ileal contents. Data were analyzed using SAS 9.4 with pen as the experimental unit and pen location as the blocking factor. Results of these experiments demonstrated broilers fed 1.12 and 1.21% digestible Lys diets with added protease had a 2-point improvement in feed conversion ratio (FCR) compared with chicks fed these diets without protease. Increasing amino acid density improved FCR in broilers and poults and improved BW, ADG, and ADFI in poults. There was no evidence that added protease had an effect on BW, ADG, or ADFI in broilers or poults. Finally, ileal amino acid digestibility was not affected by amino acid density or protease inclusion for either 20-day-old broiler chicks or 42-day-old turkey poults.http://www.sciencedirect.com/science/article/pii/S1056617121000118amino acidbroilerdigestibilityexogenous proteaselysineturkey |
| spellingShingle | C.N. Truelock H.K. Wecker C.J. Delfelder C.E. Evans R.A. Donadelli C.G. Aldrich M.A. Barrios C.R. Stark R.S. Beyer J.M. Gonzalez C.B. Paulk Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry Journal of Applied Poultry Research amino acid broiler digestibility exogenous protease lysine turkey |
| title | Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry |
| title_full | Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry |
| title_fullStr | Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry |
| title_full_unstemmed | Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry |
| title_short | Effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry |
| title_sort | effects of dietary amino acid density and exogenous protease inclusion on growth performance and apparent ileal amino acid digestibility in poultry |
| topic | amino acid broiler digestibility exogenous protease lysine turkey |
| url | http://www.sciencedirect.com/science/article/pii/S1056617121000118 |
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