An evaluation of the protein and energy requirements in long-life laying hens
SUMMARY: Modern layer genotypes can remain in production until they reach 100 wk of age. Conceptually, they are considered ‘long-life’ layers. Work on their nutrient requirements has been sparsely reported and is poorly understood. This study measured the response of individually housed Hy-Line Silv...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-03-01
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| Series: | Journal of Applied Poultry Research |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1056617122000800 |
| _version_ | 1828001823982616576 |
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| author | Frederik J. Kleyn Mariana Ciacciariello |
| author_facet | Frederik J. Kleyn Mariana Ciacciariello |
| author_sort | Frederik J. Kleyn |
| collection | DOAJ |
| description | SUMMARY: Modern layer genotypes can remain in production until they reach 100 wk of age. Conceptually, they are considered ‘long-life’ layers. Work on their nutrient requirements has been sparsely reported and is poorly understood. This study measured the response of individually housed Hy-Line Silver Brown hens aged 80 to 90 wk to 3 levels of energy (AMEn) and 4 levels of balanced protein in which standardized ileal digestible lysine (SID Lys) was used as a proxy for balance protein. The hens manipulated feed intake such that calorie consumption remained constant across all levels of dietary AMEn. Birds with a higher daily egg mass output consumed more SID Lys daily. Dietary SID Lys levels had a small but significant negative impact on egg mass output. Dietary energy and protein levels had no impact on egg composition. This study demonstrated that individually housed long-life Hy-Line Silver Brown hens have an AMEn requirement of 1,209 kJ/day, and this requirement can be met using diets ranging from 11.0 MJ/kg to 12.5 MJ/kg. The SID Lys requirements were 610 mg/day or less. These findings are of relevance to the practical feeding of long-life hens. |
| first_indexed | 2024-04-10T06:34:49Z |
| format | Article |
| id | doaj.art-205ec40dd8244fd7ae8cbd1ade0e350b |
| institution | Directory Open Access Journal |
| issn | 1056-6171 |
| language | English |
| last_indexed | 2024-04-10T06:34:49Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Applied Poultry Research |
| spelling | doaj.art-205ec40dd8244fd7ae8cbd1ade0e350b2023-03-01T04:30:47ZengElsevierJournal of Applied Poultry Research1056-61712023-03-01321100319An evaluation of the protein and energy requirements in long-life laying hensFrederik J. Kleyn0Mariana Ciacciariello1Spesfeed Consulting (Pty) Ltd., South Africa; University of KwaZulu-Natal, Pietermaritzburg, South Africa; Corresponding author:University of KwaZulu-Natal, Pietermaritzburg, South AfricaSUMMARY: Modern layer genotypes can remain in production until they reach 100 wk of age. Conceptually, they are considered ‘long-life’ layers. Work on their nutrient requirements has been sparsely reported and is poorly understood. This study measured the response of individually housed Hy-Line Silver Brown hens aged 80 to 90 wk to 3 levels of energy (AMEn) and 4 levels of balanced protein in which standardized ileal digestible lysine (SID Lys) was used as a proxy for balance protein. The hens manipulated feed intake such that calorie consumption remained constant across all levels of dietary AMEn. Birds with a higher daily egg mass output consumed more SID Lys daily. Dietary SID Lys levels had a small but significant negative impact on egg mass output. Dietary energy and protein levels had no impact on egg composition. This study demonstrated that individually housed long-life Hy-Line Silver Brown hens have an AMEn requirement of 1,209 kJ/day, and this requirement can be met using diets ranging from 11.0 MJ/kg to 12.5 MJ/kg. The SID Lys requirements were 610 mg/day or less. These findings are of relevance to the practical feeding of long-life hens.http://www.sciencedirect.com/science/article/pii/S1056617122000800egg productionegg qualityenergylong-life layerlysine |
| spellingShingle | Frederik J. Kleyn Mariana Ciacciariello An evaluation of the protein and energy requirements in long-life laying hens Journal of Applied Poultry Research egg production egg quality energy long-life layer lysine |
| title | An evaluation of the protein and energy requirements in long-life laying hens |
| title_full | An evaluation of the protein and energy requirements in long-life laying hens |
| title_fullStr | An evaluation of the protein and energy requirements in long-life laying hens |
| title_full_unstemmed | An evaluation of the protein and energy requirements in long-life laying hens |
| title_short | An evaluation of the protein and energy requirements in long-life laying hens |
| title_sort | evaluation of the protein and energy requirements in long life laying hens |
| topic | egg production egg quality energy long-life layer lysine |
| url | http://www.sciencedirect.com/science/article/pii/S1056617122000800 |
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