Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economics
SUMMARY: The current objective was to expand on previous research using the Cobb MV × Cobb 500 to determine its finisher digestible Lys (dLys) requirement (Req; d 28–41), as well as the effect of feeding varying finisher dLys levels on performance, processing, and economics. This was a 2 Sex (male o...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Journal of Applied Poultry Research |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1056617122000873 |
| _version_ | 1828001869576798208 |
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| author | D.G. Dennehy A.T. Brown C. Coto L. Mejia K.G.S. Wamsley |
| author_facet | D.G. Dennehy A.T. Brown C. Coto L. Mejia K.G.S. Wamsley |
| author_sort | D.G. Dennehy |
| collection | DOAJ |
| description | SUMMARY: The current objective was to expand on previous research using the Cobb MV × Cobb 500 to determine its finisher digestible Lys (dLys) requirement (Req; d 28–41), as well as the effect of feeding varying finisher dLys levels on performance, processing, and economics. This was a 2 Sex (male or female) × 8 dLys factorial arrangement, wherein the experimental diets consisted of a practical control; (PRAC-CON; 0.94% dLys) and 7 other diets with varying dLys concentrations (0.72%, 0.80%, 0.88%, 0.94%, 1.02%, 1.10%, and 1.18%) Chicks were fed common starter (1.28% dLys) and grower diets (grower 1 and 2 dLys were 1.18 and 1.08%, respectively). In general, males had improved performance versus females while females had increased processing yield (% of live weight) vs. males. Also, increasing finisher dLys resulted in improvements in performance and processing metrics, regardless of sex. Quadratic regression (QR; 95% of vertex) and linear and quadratic broken line (LBL; QBL) models were utilized to estimate dLys Req for each sex. The estimated dLys Req range for females was 0.752-1.292% and males, 0.748 to 1.320%, when using all models. An economic model determined 1.10% finisher dLys to be most profitable. These data demonstrate that increasing finisher dLys can improve Cobb MV × Cobb 500 performance and processing; however, the optimal dLys Req can vary depending on sex, regression model, response parameter, and economics. |
| first_indexed | 2024-04-10T06:35:27Z |
| format | Article |
| id | doaj.art-b23794225dba4dbc912554dbfdcc79db |
| institution | Directory Open Access Journal |
| issn | 1056-6171 |
| language | English |
| last_indexed | 2024-04-10T06:35:27Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Applied Poultry Research |
| spelling | doaj.art-b23794225dba4dbc912554dbfdcc79db2023-03-01T04:30:50ZengElsevierJournal of Applied Poultry Research1056-61712023-03-01321100326Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economicsD.G. Dennehy0A.T. Brown1C. Coto2L. Mejia3K.G.S. Wamsley4Department of Poultry Science, Mississippi State University, Mississippi, MS 39762, USADepartment of Poultry Science, Mississippi State University, Mississippi, MS 39762, USACobb-Vantress, Siloam Springs, AR, USACobb-Vantress, Siloam Springs, AR, USADepartment of Poultry Science, Mississippi State University, Mississippi, MS 39762, USA; Corresponding author:SUMMARY: The current objective was to expand on previous research using the Cobb MV × Cobb 500 to determine its finisher digestible Lys (dLys) requirement (Req; d 28–41), as well as the effect of feeding varying finisher dLys levels on performance, processing, and economics. This was a 2 Sex (male or female) × 8 dLys factorial arrangement, wherein the experimental diets consisted of a practical control; (PRAC-CON; 0.94% dLys) and 7 other diets with varying dLys concentrations (0.72%, 0.80%, 0.88%, 0.94%, 1.02%, 1.10%, and 1.18%) Chicks were fed common starter (1.28% dLys) and grower diets (grower 1 and 2 dLys were 1.18 and 1.08%, respectively). In general, males had improved performance versus females while females had increased processing yield (% of live weight) vs. males. Also, increasing finisher dLys resulted in improvements in performance and processing metrics, regardless of sex. Quadratic regression (QR; 95% of vertex) and linear and quadratic broken line (LBL; QBL) models were utilized to estimate dLys Req for each sex. The estimated dLys Req range for females was 0.752-1.292% and males, 0.748 to 1.320%, when using all models. An economic model determined 1.10% finisher dLys to be most profitable. These data demonstrate that increasing finisher dLys can improve Cobb MV × Cobb 500 performance and processing; however, the optimal dLys Req can vary depending on sex, regression model, response parameter, and economics.http://www.sciencedirect.com/science/article/pii/S1056617122000873digestible lysinebroilerrequirementperformance |
| spellingShingle | D.G. Dennehy A.T. Brown C. Coto L. Mejia K.G.S. Wamsley Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economics Journal of Applied Poultry Research digestible lysine broiler requirement performance |
| title | Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economics |
| title_full | Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economics |
| title_fullStr | Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economics |
| title_full_unstemmed | Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economics |
| title_short | Determining the digestible lysine requirement of Cobb MV × Cobb 500 FF broilers from 28-41 days of age and the effect of feeding varying digestible lysine levels on performance, processing, and economics |
| title_sort | determining the digestible lysine requirement of cobb mv cobb 500 ff broilers from 28 41 days of age and the effect of feeding varying digestible lysine levels on performance processing and economics |
| topic | digestible lysine broiler requirement performance |
| url | http://www.sciencedirect.com/science/article/pii/S1056617122000873 |
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