Optimum Digestible Valine to Lysine Ratio for Meat-Type Quails from 15 to 35 Days of Age

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Alves, W. J. [UNESP]
Viana, G. S.
Barreto, S. L. T.
Muniz, J. C. L.
Hannas, M.
Silva, A. D.
Arnaut, P. R.
Barros, V. R. M. S.
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Facta-fundacio Arnco Ciencia Tecnologia Avicolas
This study was conducted to estimate the dig. valine to lysine (Val:Lys) ideal ratio for meat-type quails from 15 to 35 d of age. A total of 385, 15-day-old not sexed quails, were randomly assigned to five treatments, each one seven times replicated with eleven quails per experimental unit. Experimental treatments consisted of five dig. Val: Lys ratios (0.65; 0.70; 0.75; 0.80 and 0.85). Ideal dig. Val: Lys ratio was estimated using polynomial regression and linear broken-line regression model. Significant effect was considered when p <= 0.05. Feed conversion ratio was not affected by dig. Val: Lys ratios in any of the assessed phases. From 15 to 21 d of age Val: Lys ratios increased linearly feed intake, weight gain and body weight. From 15 to 28 d of age, weight gain and body weight were both optimized by the Val:Lys ratio of 0.77. A linear effect of dig. Val:Lys ratios was observed on weight gain and final body weight from 15 to 35 d of age. From 15 to 35 d of age, according to linear broken-line regression model, the dig. Val:Lys ideal ratios for optimum final body weight and weight gain were 0.77 and 0.76, respectively. Based on the results the estimated dig. Val Lys ratio for optimum meat-type quail performance from 15 to 35 d of age is 0.77
Branched-chain amino acids, Coturnix coturnix coturnix, digestible amino acids
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Brazilian Journal Of Poultry Science. Campinas: Facta-fundacio Arnco Ciencia Tecnologia Avicolas, v. 19, n. 2, p. 185-190, 2017.