Resumo

GUTIERREZ-HERNANDEZ, Sandra et al. Digestible lysine and threonine in diets for growing pigs. Ecosistemas y recur. agropecuarios [online]. 2016, vol.3, n.7, pp.33-41. ISSN 2007-901X.

The objective was to evaluate two levels of lysine and threonine for growing pigs on growth performance, carcass characteristics and plasma urea concentration. In experiment 1, 36 pigs were used with initial body weight of 27.65 ± 5.65 kg during four weeks, allotted in a completely randomized design with a factorial arrangement 2 (lysine: 0.83 and 0.93 %) with x 2 (threonine: 05.52 and 0.62 %). The variables were analized ANOVA and treatment means were compared with Tukey's test. There was not effect on the concentration of lysine and threonine in all variables (p > 0.05). In experiment 2, 35 pigs were used with initial body weight of 16.71 ± 7.85 kg during six weeks, were evaluated five levels of threonine (0.52, 0.62, 0.72, 0.82 and 0.92 %), distributed in a completely randomized design. Orthogonal contrasts were used to determine linear, quadratic and cubic effects to estimate the optimal biological level (OBL) for each variable. The NOB for average daily gain and feed consumption was 0.90 % digestible threonine. In experiment 1 and 2 the concentration of urea in plasma was modified by the amount of lysine and threonine in the diet (p < 0.05). We conclude that the most appropriate level of digestible lysine to diet is 0.83 % and 0.90 % digestible threonine.

Palavras-chave : Carcass characteristics; productive performance; lysine; threonine.

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