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Este experimento foi realizado para determinar as exigências nutricionais de metionina + cistina total e digestível para alevinos revertidos de tilápia do Nilo (Perciformes, Cichlidae). Durante 40 dias, alevinos com 1,31 ± 0,06 g cada, foram alimentados com rações com 0,89; 0,94; 0,99; 1,09; 1,19 e 1,29% de metionina + cistina total, correspondente a 0,83; 0,88; 0,93; 1,03; 1,13 e 1,23% de metionina + cistina digestível. As rações foram suplementadas com níveis crescentes de DL-metionina, resultando em rações com taxas 50,61; 0,54; 56,7; 62,80; 68,90 e 75% de metionina + cistina/lisina (conceito de proteína ideal), baseado em valores de aminoácidos digestíveis. Os níveis crescentes de metionina + cistina reduziram linearmente a taxa de sobrevivência. As rações com níveis de 1,10% e 1,00% de metionina + cistina total e digestível, respectivamente, apresentaram os melhores resultados sobre o desempenho de alevinos de tilápias, correspondente a rações com 60,11 e 60,98% de metionina + cistina total e digestível/lisina total e digestível, respectivamente. The nutritional requirements of total and digestible methionine for reversed fingerlings of the Nile tilapia (Perciformes, Cichlidae) were determined. During a 40-day period fingerlings, weighing 1.31 ± 0.06g each, were fed on diets with 0.89; 0.94; 0.99; 1,09; 1.19 and 1.29% of total methionine + cystine, corresponding to 0.83; 0.88; 0.93; 1.03; 1.13 and 1.23% of digestible methionine + cystine. Since diets were supplemented with increasing levels of DL-methionine, diets reached 50.61; 0.54; 56.7; 62.80; 68.90 e 75% of methionine + cystine/lysine ratio (ideal protein concept), based on digestible amino acids values. Increasing methionine + cystine levels linearly diminished survival rate. Diets with 1.10% and 1.00% levels of total and digestible sulfur amino acid respectively had the best performance results for Nile tilapia fingerlings. This corresponds to 60.11 and 60.98% of total and digestible methionine + cystine/total and digestible lysine respectively

acta scientiarum. animal sciences

Exigências de metionina + cistina total e digestível para alevinos revertidos de tilápia do Nilo, &lt;em&gt;Oreochromis niloticus&lt;/em&gt; (L.), baseadas no conceito de proteína ideal