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Ciência Rural

versão On-line ISSN 1678-4596

Resumo

CARVALHO, Maria Araci Grapiuna de; FERNANDES, Luiz Fernando Loureiro  e  GOMES, Levy de Carvalho. Digestibility, protein retention rate and ammonia excretion in juvenile fat snook (Centropomus parallelus) fed with different protein levels. Cienc. Rural [online]. 2017, vol.47, n.7, e20160369.  Epub 22-Jun-2017. ISSN 1678-4596.  http://dx.doi.org/10.1590/0103-8478cr20160369.

The aim of this study was to determine the level of dietary crude protein (CP) (480, 400, 440, 520 and 560g kg-1) in rations for juvenile II fat snook (Centropomus parallelus) that best promotes protein absorption and lower excretion of nitrogenous products. Three experiments were conducted: the first assessed the protein retention rate; the second evaluated ammonia excretion; and the third determined the best digestibility coefficient. The estimated protein retention rate showed a positive quadratic response to dietary CP with maximum retention at the 510.20g kg-1 protein level, and increasing levels of protein resulted in a greater total ammonia excretion rate in water. The mean apparent protein digestibility coefficient values increased with increasing levels of dietary protein up to 520g kg-1, where they stabilized. As determined by regression, the level of dietary CP that promotes the best digestibility was 495.62g kg-1.

Palavras-chave : crude digestible protein; fish culture; nitrogen excretion; diet.

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