Growth and energy metabolism of Nile tilapia juveniles fed glycerol

Pesquisa Agropecuária Brasileira

Diego Vicente Da Costa¹  Renan Rosa Paulino¹  Daniel Okamura¹  Marinez Moraes De Oliveira¹  Priscila Vieira E Rosa¹ 

关键词: Oreochromis niloticus;    alternative feed;    carbohydrate;    nutrition;    Oreochromis niloticus;    alimentos alternativos;    carboidratos;    nutrição;   

DOI  :  10.1590/S0100-204X2015000500001

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the effect of inclusion of dietary glycerol in replacement to starch on the growth and energy metabolism of Nile tilapia juveniles. The experiment was carried out in a completely randomized design with four treatments (0, 5, 10, and 15% purified glycerol) and six replicates. Pelleted, isonitrogenous, and isocaloric diets were provided for 60 days. Growth performance parameters and muscle glucose and protein concentrations were not affected by dietary glycerol levels. The treatment with 15% glycerol presented higher levels of muscle and liver triglycerides. A quadratic effect of treatments on muscle and liver triglyceride concentrations was observed. The treatment with 0% glycerol presented higher hepatic glucose levels than the one with 15%. Treatments did not differ for concentrations of liver protein, as well as of plasma glucose, triglycerides, and protein. Treatments with 10 and 15% glycerol showed higher activity of the glucose-6-phosphate-dehydrogenase enzyme than the treatment with 5%; however, there were no significant differences in the hepatic activities of the malic and glycerol kinase enzymes. A linear positive effect of treatments was observed on the activity of the glycerol kinase enzyme in liver. Levels of glycerol inclusion above 10% in the diet of Nile tilapia juveniles characterize it as a lipogenic nutrient.

【 授权许可】

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