Fitase em rações para juvenis de pacu (Piaractus mesopotamicus)

Autores

Palavras-chave:

enzima, desempenho, ossos, peixe

Resumo

Este trabalho foi realizado para avaliar os efeitos da utilização de fitase sobre o desempenho e retenção de minerais em juvenis de pacu. Foram utilizados 160 peixes (16,42 ± 2 g), que foram alimentados com rações contendo 0; 500; 1.000 e 2.000 unidades de fitase (UF)/kg e com aproximadamente 3.238 kcal de energia digestí­­vel, 30% de proteí­­na bruta e 0,31% de fósforo disponí­­vel. Os peixes foram alimentados até saciedade aparente durante 60 dias. Não foi observado efeito dos ní­­veis de fitase nas rações sobre as variáveis de sobrevivência, umidade, proteí­­na bruta e gordura na carcaça. Foi observado aumento linear dos ní­­veis de fitase nas dietas sobre o ganho de peso, cinzas da carcaça e dos ossos. Foi observado efeito quadrático dos ní­­veis de fitase sobre a conversão alimentar, taxa de eficiência proteica e ní­­veis de cálcio e fósforo nos ossos, em que os melhores valores foram estimados em 433,33; 425; 1875 e 1833 UF/kg dieta respectivamente. Concluiu-se que a suplementação ótima de fitase em rações para juvenis de pacu é de 433,33 UF/kg.

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2018-11-04

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