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vol.36 issue2Digestible lysine levels in semi-heavy laying hens in the period from 28 to 44 weeks of ageThreonine-lysine ratio on the requirements of digestible lysine in diets for broilers: lisina sobre a exigência de lisina digestível em dietas para frangos de corte author indexsubject indexarticles search
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Acta Scientiarum. Animal Sciences

On-line version ISSN 1807-8672

Abstract

DUARTE, Karina Ferreira et al. Digestible valine requirements for broilers from 22 and 42 days old. Acta Sci., Anim. Sci. [online]. 2014, vol.36, n.2, pp.151-156. ISSN 1807-8672.  https://doi.org/10.4025/actascianimsci.v36i2.22761.

Current experiment established different criteria to evaluate the requirements of digestible valine for broilers from 22 and 42 days of age, by different regression models (quadratic, exponential and Linear Response Plateau) and, in the case of statistical significance, the comparison of means by Duncan test at 5% probability. A total of 1,920 Cobb 500 male broilers were used and distributed in an entirely randomized experimental design, with 6 treatments (6 digestible valine levels: 0.7192, 0.7729, 0.8265, 0.8802, 0.9339 and 0.9876%) and 8 replications, with 40 broilers each. Data on performance and carcass characteristics were evaluated. The level of 0.8265% digestible valine was considered standard. The inclusion of 0.816, 0.848 and 0.903% of digestible valine levels, corresponding to digestible valine:lysine ratios of approximately 76.00%, 79.00% and 84.12%, provided best feed intake, weight gain and feed conversion ratio, respectively for broiler from 22 to 42 days of age.

Keywords : digestible amino acids; ideal protein; performance; regression analyses.

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