ABSTRACT
Abstract This study was conducted to evaluate the inclusion of new prebiotics in the diet on performance and metabolism (liver protein, glucose and glycogen) of Nile tilapia. For 60 days, 720 Nile tilapia (3.4 ± 0.60 g) were maintained in 24 polypropylene tanks (280 liters). Fish were fed with experimental diets with addition of 2.5 and 5 g kg-1 of dietary fiber of citrus pulp (DFCP), dietary fiber of linseed (DFL) and Actigen®. The experimental design was completely randomized with a 3x2 factorial arrangement. At the end of the period, there was higher final weight of tilapias fed on diets containing DFCP and DFL, and regardless of prebiotic, the best results in the final weight and length were observed for inclusion of 2.5 g kg-1. There was higher body protein deposition in tilapia fed on diets containing DFCP, without differences from those with inclusion of DFL. Total fat deposition was higher for the lowest level of inclusion (2.5 g kg-1). The digestive somatic index was higher for the diet with inclusion of DFCP, which did not differ from the diet with inclusion of Actigen®. There were higher concentrations of liver glycogen in the diets containing DFCP and Actigen®. Faced with the search for alternative growth promoters, this study confirms the possibility of using the new prebiotics (DFCP and DFL) in nutrition of Nile tilapia, because they showed efficiency equivalent to the prebiotic Actigen®.
Subject(s)
Animals , Dietary Fiber/administration & dosage , Cichlids/growth & development , Cichlids/metabolism , Animal FeedABSTRACT
O objetivo deste estudo foi avaliar o uso da própolis como promotor de crescimento para o jundiá na fase inicial. Foram utilizados 450 juvenis de jundiá com 2,02 ± 0,55 g, alimentados com dietas contendo quatro níveis de própolis (0,5; 1,0; 1,5 e 2,0%), além de um tratamento controle (sem inclusão de própolis). Utilizou-se um sistema de recirculação de água, composto por 15 tanques (230 L de volume útil). Durante o ensaio experimental os parâmetros de qualidade da água foram mantidos em condições ideais para os peixes. Foram avaliados parâmetros de crescimento, proteína corporal, gordura corporal e glicose. Foi utilizado um delineamento inteiramente casualizado, com 5 tratamentos e 3 repetições. Os dados obtidos foram submetidos ao teste de normalidade e análise de variância. Quando a ANOVA foi significativa para as médias, aplicou-se o teste de Dunnet, utilizando o programa Statistical Analysis System®. Não foram observadas diferenças significativas (P>0,05) da suplementação de própolis na dieta sobre os parâmetros de crescimento. A quantidade de gordura corporal foi reduzida com a adição de própolis acima de 0,5%. Maior nível de glicose foi observado nos peixes alimentados com 2% de própolis na dieta. Conclui-se que a própolis testada na dieta não foi eficaz como promotor de crescimento para o jundiá.
The aim of this study was to evaluate the use of propolis as a growth promoter for South American catfish in the initial phase. Were used 450 jundiá juvenile with 2.02 ± 0.55 g, these were fed diets containing four propolis levels (0.5, 1.0, 1.5 and 2.0%), plus a control treatment (without inclusion of propolis). It was used a water re-use system, composed by 15 tanks (230 L). During the experimental test water quality parameters were maintained in optimal conditions for fish. It was evaluated growth parameters, body protein body fat and glucose. The DIC was used, completely randomized design with 5 treatments and 3 replicates. The data were submitted to normality tests and analysis of variance. When ANOVA was significant for the means, was applied the Dunnett test, using the program Statistical Analysis System®. Were not observed significant differences (P>0.05) of the propolis inclusion on growth parameters. The amount of fat was reduced with the addition of propolis above 0.5%. Increased glucose level was observed in the fish fed with 2.0% propolis in the diet. It was concluded that the propolis tested in the diet is not effective as growth promoter for the jundiá.