Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens
Isoleucine (Ile), threonine (Thr) and tryptophan (Trp) are most likely candidates for becoming third limiting amino acids (AA) in layer diets. This work studied the effect of supplementing Ile, Thr and Trp in low-protein diets on the productive performance, egg quality and serum parameters of Hy-Li...
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Universidade Estadual de Londrina
2015-06-01
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doaj-6ab816bba25f41f7be7f315edbe1b9bd2020-11-24T22:29:11ZengUniversidade Estadual de LondrinaSemina: Ciências Agrárias1676-546X1679-03592015-06-013631735174410.5433/1679-0359.2015v36n3p1735Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hensIván Camilo Ospina Rojas 0Alice Eiko Murakami 1Jamile Corina Fanhani 2Karla Paola Picoli 3Maria José Baptista Barbosa 4Universidade Estadual de MaringáUniversidade Estadual de MaringáUniversidade Estadual de MaringáUniversidade Estadual de MaringáUniversidade Estadual de Maringá Isoleucine (Ile), threonine (Thr) and tryptophan (Trp) are most likely candidates for becoming third limiting amino acids (AA) in layer diets. This work studied the effect of supplementing Ile, Thr and Trp in low-protein diets on the productive performance, egg quality and serum parameters of Hy-Line W36 laying hens. A total of 360 30-week-old laying hens were distributed in a completely randomized design into 9 treatments with 5 replications of 8 birds each. Treatments consisted of a control diet that was based on corn and soybean meal formulated with 15.5% CP. A second diet with 13% CP was formulated to meet the requirements for all essential AA of the control diet, except for Ile, Thr and Trp. The other treatments consisted of individual and combined supplementation of the aforementioned AA in the 13% CP diet. The reduction of the dietary protein level negatively influenced (p<0.05) the productivity of the hens, impairing egg production, feed conversion (kg kg-1 and kg dz-1), and egg mass. However, these variables were restored with individual and combined supplementation of the three AA in the 13% CP diet. Individually-supplemented diets with Ile, or combined with Thr and/or Trp, resulted in hens with lower (p<0.05) serum uric acid and ammonia concentrations as compared to birds receiving diets with 15.5% (control) and 13% CP. The protein levels can be reduced (13% CP) in the diet of commercial laying hens without compromising performance, egg quality or serum parameters with individual Ile, Thr or Trp supplementation. http://www.uel.br/revistas/uel/index.php/semagrarias/editor/submission/18179Amino acid; Crude protein; Egg quality; Performance; Poultry |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Iván Camilo Ospina Rojas Alice Eiko Murakami Jamile Corina Fanhani Karla Paola Picoli Maria José Baptista Barbosa |
spellingShingle |
Iván Camilo Ospina Rojas Alice Eiko Murakami Jamile Corina Fanhani Karla Paola Picoli Maria José Baptista Barbosa Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens Semina: Ciências Agrárias Amino acid; Crude protein; Egg quality; Performance; Poultry |
author_facet |
Iván Camilo Ospina Rojas Alice Eiko Murakami Jamile Corina Fanhani Karla Paola Picoli Maria José Baptista Barbosa |
author_sort |
Iván Camilo Ospina Rojas |
title |
Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens |
title_short |
Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens |
title_full |
Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens |
title_fullStr |
Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens |
title_full_unstemmed |
Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens |
title_sort |
tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens |
publisher |
Universidade Estadual de Londrina |
series |
Semina: Ciências Agrárias |
issn |
1676-546X 1679-0359 |
publishDate |
2015-06-01 |
description |
Isoleucine (Ile), threonine (Thr) and tryptophan (Trp) are most likely candidates for becoming third limiting amino acids (AA) in layer diets. This work studied the effect of supplementing Ile, Thr and Trp in low-protein diets on the productive performance, egg quality and serum parameters of Hy-Line W36 laying hens. A total of 360 30-week-old laying hens were distributed in a completely randomized design into 9 treatments with 5 replications of 8 birds each. Treatments consisted of a control diet that was based on corn and soybean meal formulated with 15.5% CP. A second diet with 13% CP was formulated to meet the requirements for all essential AA of the control diet, except for Ile, Thr and Trp. The other treatments consisted of individual and combined supplementation of the aforementioned AA in the 13% CP diet. The reduction of the dietary protein level negatively influenced (p<0.05) the productivity of the hens, impairing egg production, feed conversion (kg kg-1 and kg dz-1), and egg mass. However, these variables were restored with individual and combined supplementation of the three AA in the 13% CP diet. Individually-supplemented diets with Ile, or combined with Thr and/or Trp, resulted in hens with lower (p<0.05) serum uric acid and ammonia concentrations as compared to birds receiving diets with 15.5% (control) and 13% CP. The protein levels can be reduced (13% CP) in the diet of commercial laying hens without compromising performance, egg quality or serum parameters with individual Ile, Thr or Trp supplementation.
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topic |
Amino acid; Crude protein; Egg quality; Performance; Poultry |
url |
http://www.uel.br/revistas/uel/index.php/semagrarias/editor/submission/18179 |
work_keys_str_mv |
AT ivancamiloospinarojas tryptophanthreonineandisoleucinesupplementationinlowproteindietsforcommerciallayinghens AT aliceeikomurakami tryptophanthreonineandisoleucinesupplementationinlowproteindietsforcommerciallayinghens AT jamilecorinafanhani tryptophanthreonineandisoleucinesupplementationinlowproteindietsforcommerciallayinghens AT karlapaolapicoli tryptophanthreonineandisoleucinesupplementationinlowproteindietsforcommerciallayinghens AT mariajosebaptistabarbosa tryptophanthreonineandisoleucinesupplementationinlowproteindietsforcommerciallayinghens |
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