| Registro completo |
| Provedor de dados: |
R. Bras. Zootec.
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| País: |
Brazil
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| Título: |
Digestible tryptophan:lysine ratio for laying hens
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| Autores: |
Lima,Matheus Ramalho de
Costa,Fernando Guilherme Perazzo
Guerra,Ricardo Romão
Silva,José Humberto Vilar da
Rabello,Carlos Bôa-Viagem
Miglino,Maria Angelica
Nogueira,Eduardo Terra
Pinheiro,Sarah Gomes
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| Data: |
2012-10-01
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| Ano: |
2012
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| Palavras-chave: |
Egg production
Histological effects
Poultry industry
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| Resumo: |
The objective of this study was to evaluate the requirement of digestible tryptophan for white laying hens in the production stage fed diets of different digestible tryptophan:digestible lysine ratios, as well as animal performance and histological alterations in their reproductive and digestive systems. A total of 280 white laying hens at 29 weeks of age were distributed in a completely randomized design with five treatments and seven replications with eight birds in each. The treatments consisted of a base feed, formulated with corn, soybean meal and corn gluten meal, and supplemented with the synthetic amino acids L-lysine, DL-methionine, L-threonine, L-isoleucine, L-arginine, and L-valine, so as to meet the nutritional requirements for laying hens, except for digestible tryptophan. The basal diet was supplemented with 0.00; 0.017; 0.035; 0.052; and 0.069 g/kg of L-tryptophan in substitution for corn starch with the objective of reaching the levels of 0.151; 0.167; 0.183; 0.199; and 0.215 g/kg of digestible tryptophan in the feed. For the ratio between digestible amino acids and lysine, the recommendation of Brazilian Tables for Poultry and Swine was followed, except for the digestible tryptophan:digestible lysine ratios, which were 19, 21, 23, 25 and 27 for each treatment. The variation in the digestible tryptophan:digestible lysine ratio promoted changes in performance and in the histological characteristics, improving the results. The digestible tryptophan:digestible lysine ratio of 24.5% in the feed of white laying hens in production stage promotes better animal performance and histological results.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000010
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| Editor: |
Sociedade Brasileira de Zootecnia
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| Relação: |
10.1590/S1516-35982012001000010
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Zootecnia v.41 n.10 2012
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| Direitos: |
info:eu-repo/semantics/openAccess
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