Nutritional requirements of total and digestible methionine + cystine for reversed fingerlings of the Nile tilapia Oreochromins niloticus (L.) based on the ideal protein concept

• Autor(a) principal: Furuya, Wilson Massamitu
• Data de Publicação: 2008
• Outros Autores: Hayashi, Carmino, Furuya, Valéria Rossetto Barriveira, Botaro, Danielle, Silva, Lilian Carolina da, Neves, Patrícia Ribeiro
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum. Animal Sciences (Online)
• Texto Completo: https://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/2641
• topic: alevinos; metionina cistina; Oreochromis niloticus; proteína ideal; tilápia do Nilo; 5.04.00.00-2 Zootecnia

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.