Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary System
This study was performed to investigate the effects of apparent metabolizable energy (AME<sub>n</sub>) and protein levels on laying performance, egg quality, blood parameters, blood biochemistry, and apparent total tract digestibility of energy and nutrients in diets fed to laying hens i...
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MDPI AG
2022-12-01
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| Series: | Animals |
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| Online Access: | https://www.mdpi.com/2076-2615/12/24/3513 |
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| author | Chan-Ho Kim Hwan-Ku Kang |
| author_facet | Chan-Ho Kim Hwan-Ku Kang |
| author_sort | Chan-Ho Kim |
| collection | DOAJ |
| description | This study was performed to investigate the effects of apparent metabolizable energy (AME<sub>n</sub>) and protein levels on laying performance, egg quality, blood parameters, blood biochemistry, and apparent total tract digestibility of energy and nutrients in diets fed to laying hens in an aviary system. A total of 560 Hy-Line Brown laying hens (age = 30 week) were distributed in a completely randomized experimental design in 2 × 2 factorial arrangements with 2 metabolizable energy levels (2700 and 2800 kcal AME<sub>n</sub>/kg) and 2 protein levels (16.5 and 14.5% CP). Four treatments and four replicates of 40 birds each (stocking density = 15 birds/m<sup>2</sup>) were prepared. Results revealed no significant interaction between AME<sub>n</sub> and CP in the diet in terms of egg production, floor eggs, broken and dirty egg production, egg mass, feed intake, and feed conversion ratio of laying hens. However, egg weight was affected. As dietary energy and CP levels (2800 kcal of AME<sub>n</sub>/kg and 16.5% CP) increased, egg weight increased (<i>p</i> < 0.05). Egg weight, feed intake, and feed conversion ratio significantly differed (<i>p</i> < 0.05) as the energy content in the feed increased. Ether extract significantly varied (<i>p</i> < 0.05) as the energy content in the feed increased. In conclusion, laying performance and egg quality of Hy-Line Brown laying hens in the middle stage of egg production (30 to 50 weeks) were not affected by different dietary energy and protein levels, but feed intake decreased with an increasing level of AME<sub>n</sub> in diets. Ether extract significantly varied as the energy content in the feed increased. |
| first_indexed | 2024-03-09T17:25:28Z |
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| institution | Directory Open Access Journal |
| issn | 2076-2615 |
| language | English |
| last_indexed | 2024-03-09T17:25:28Z |
| publishDate | 2022-12-01 |
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| record_format | Article |
| series | Animals |
| spelling | doaj.art-e7c9b0b7b6984d82adf167346f5466a52023-11-24T12:51:00ZengMDPI AGAnimals2076-26152022-12-011224351310.3390/ani12243513Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary SystemChan-Ho Kim0Hwan-Ku Kang1Animal Welfare Research Team, National Institute of Animal Science, Rural Development Administration, Wanju 55365, Republic of KoreaPoultry Research Institute, Rural Development Administration National Institute of Animal Science, Pyeongchang 25342, Republic of KoreaThis study was performed to investigate the effects of apparent metabolizable energy (AME<sub>n</sub>) and protein levels on laying performance, egg quality, blood parameters, blood biochemistry, and apparent total tract digestibility of energy and nutrients in diets fed to laying hens in an aviary system. A total of 560 Hy-Line Brown laying hens (age = 30 week) were distributed in a completely randomized experimental design in 2 × 2 factorial arrangements with 2 metabolizable energy levels (2700 and 2800 kcal AME<sub>n</sub>/kg) and 2 protein levels (16.5 and 14.5% CP). Four treatments and four replicates of 40 birds each (stocking density = 15 birds/m<sup>2</sup>) were prepared. Results revealed no significant interaction between AME<sub>n</sub> and CP in the diet in terms of egg production, floor eggs, broken and dirty egg production, egg mass, feed intake, and feed conversion ratio of laying hens. However, egg weight was affected. As dietary energy and CP levels (2800 kcal of AME<sub>n</sub>/kg and 16.5% CP) increased, egg weight increased (<i>p</i> < 0.05). Egg weight, feed intake, and feed conversion ratio significantly differed (<i>p</i> < 0.05) as the energy content in the feed increased. Ether extract significantly varied (<i>p</i> < 0.05) as the energy content in the feed increased. In conclusion, laying performance and egg quality of Hy-Line Brown laying hens in the middle stage of egg production (30 to 50 weeks) were not affected by different dietary energy and protein levels, but feed intake decreased with an increasing level of AME<sub>n</sub> in diets. Ether extract significantly varied as the energy content in the feed increased.https://www.mdpi.com/2076-2615/12/24/3513aviary systemlaying hensapparent metabolizable energyproteinnutrient |
| spellingShingle | Chan-Ho Kim Hwan-Ku Kang Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary System Animals aviary system laying hens apparent metabolizable energy protein nutrient |
| title | Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary System |
| title_full | Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary System |
| title_fullStr | Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary System |
| title_full_unstemmed | Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary System |
| title_short | Effects of Energy and Protein Levels on Laying Performance, Egg Quality, Blood Parameters, Blood Biochemistry, and Apparent Total Tract Digestibility on Laying Hens in an Aviary System |
| title_sort | effects of energy and protein levels on laying performance egg quality blood parameters blood biochemistry and apparent total tract digestibility on laying hens in an aviary system |
| topic | aviary system laying hens apparent metabolizable energy protein nutrient |
| url | https://www.mdpi.com/2076-2615/12/24/3513 |
| work_keys_str_mv | AT chanhokim effectsofenergyandproteinlevelsonlayingperformanceeggqualitybloodparametersbloodbiochemistryandapparenttotaltractdigestibilityonlayinghensinanaviarysystem AT hwankukang effectsofenergyandproteinlevelsonlayingperformanceeggqualitybloodparametersbloodbiochemistryandapparenttotaltractdigestibilityonlayinghensinanaviarysystem |