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vol.41 issue1Available phosphorus in diets for 15 to 30 kg pigs genetically selected for meat depositionChemical and amino acid composition and true digestibility coefficients of amino acids of feather and blood meals, determined in cecectomized cocks author indexsubject indexarticles search
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Revista Brasileira de Zootecnia

On-line version ISSN 1806-9290


DUARTE, Karina Ferreira et al. Threonine requirements of 22 to 42-day-old broilers. R. Bras. Zootec. [online]. 2012, vol.41, n.1, pp.72-79. ISSN 1806-9290.

The objective of this experiment was to establish different criteria for evaluation of the requirements of digestible threonine for broilers from 22 to 42 d of age, using different regression models (quadratic, exponential, and Linear Response Plateau). A total of 1,920 22-day-old male Cobb broilers were distributed in randomized experimental design, with six treatments (six threonine levels: 0.5904, 0.6441, 0.6977, 0.7514, 0.8051, and 0.8588%) and 8 replications containing 40 broilers each one. The level of 0.6977% digestible threonine was used as standard. Data on performance and carcass characteristics were evaluated. Based on the data, the threonine level of 0.7642%, corresponding to the threonine:digestible lysine ratio of 71.19% had the best result for feed conversion, according to the Linear Response Plateau model.

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

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