Estimation of optimal ratios of digestible phenylalanine + tyrosine, histidine, and leucine to digestible lysine for performance and breast yield in broilers

Sebastian M. Franco, Fernando de C. Tavernari, Rosana C. Maia, Victor R.S.M. Barros, Luiz F.T. Albino, Horacio S. Rostagno, Guilherme R. Lelis, Arele A. Calderano, Ryan Neil Dilger

Research output: Contribution to journalArticle

Abstract

Three experiments were carried out to estimate the optimal ratios of digestible phenylalanine + tyrosine (Phe + Tyr), histidine (His), and leucine (Leu) relative to digestible lysine (Lys) for performance and carcass criteria of Cobb-500 broilers from 8 to 17 d of age. In each experiment, 160 male chicks were allocated to a completely randomized experimental design with eight replicate pens, each receiving five dietary treatments. A common, semi-purified basal diet was formulated to meet all dietary recommendations except for those of the tested amino acids (i.e., Phe + Tyr, His, and Leu). Growth performance and carcass characteristics data were analyzed using various requirement-estimation models, including 95% of the quadratic regression, linear response plateau (LRP; i.e., stepwise regression), LRP-to-quadratic regression ratio; and quadratic broken line (QBL). Graded digestible Phe + Tyr ratios elicited a quadratic response (P < 0.05) in body weight gain and linear responses (P < 0.05) in breast and breast fillet weights. Linear effects (P < 0.05) were also observed when graded ratios of digestible His were fed for feed intake and weight gain, and quadratic responses (P < 0.05) were noted for feed conversion ratio and breast and breast fillet weights and yields. Graded Leu ratios elicited quadratic responses (P < 0.05) in feed intake, weight gain, and breast and breast fillet weight and yield. Based on growth and carcass parameters, the estimated ideal digestible ratios of Phe + Tyr, His, and Leu relative to digestible Lys were 112, 38, and 104%, respectively, for broiler chicks raised from 8 to 17 d of age.

Original languageEnglish (US)
Pages (from-to)829-837
Number of pages9
JournalPoultry science
Volume96
Issue number4
DOIs
StatePublished - Apr 1 2017

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histidine
phenylalanine
leucine
breasts
tyrosine
lysine
broiler chickens
fillets
weight gain
feed intake
dietary recommendations
carcass characteristics
growth performance
plateaus
feed conversion
experimental design
chicks
amino acids
body weight
diet

Keywords

  • broiler
  • digestible amino acid
  • histidine
  • leucine
  • phenylalanine + tyrosine

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Estimation of optimal ratios of digestible phenylalanine + tyrosine, histidine, and leucine to digestible lysine for performance and breast yield in broilers. / Franco, Sebastian M.; Tavernari, Fernando de C.; Maia, Rosana C.; Barros, Victor R.S.M.; Albino, Luiz F.T.; Rostagno, Horacio S.; Lelis, Guilherme R.; Calderano, Arele A.; Dilger, Ryan Neil.

In: Poultry science, Vol. 96, No. 4, 01.04.2017, p. 829-837.

Research output: Contribution to journalArticle

Franco, Sebastian M. ; Tavernari, Fernando de C. ; Maia, Rosana C. ; Barros, Victor R.S.M. ; Albino, Luiz F.T. ; Rostagno, Horacio S. ; Lelis, Guilherme R. ; Calderano, Arele A. ; Dilger, Ryan Neil. / Estimation of optimal ratios of digestible phenylalanine + tyrosine, histidine, and leucine to digestible lysine for performance and breast yield in broilers. In: Poultry science. 2017 ; Vol. 96, No. 4. pp. 829-837.
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AU - Barros, Victor R.S.M.

AU - Albino, Luiz F.T.

AU - Rostagno, Horacio S.

AU - Lelis, Guilherme R.

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AU - Dilger, Ryan Neil

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