Diferentes proporções de fibra insolúvel e solúvel de grãos de aveia sobre a resposta biológica de ratos

Abstract

The present report had as the objective to establish relations between the different proportions of insoluble and soluble fiber from oat grains on biological response in Wistar rats fed with formulated rations with similar dietary fiber levels, but different in insoluble and soluble fiber content. For that, the total dietary fiber composition, insoluble and soluble from eight oat grains cultivars was determined, which according with these results, were grouped, by multivariate group analysis (Cluster analysis) according to the ward method, considering its proportions of insoluble and soluble fiber. From the three formed groups, grains from three cultivars were chosen (UFRGS 17, UFRGS 18 and UFRGS 20) for the realization of the biological response (8 animals per treatment). It was conduced throughout a period of 35 days, in which parameters such as daily consumption of dry matter, weight gaining, dietary conversion, feces excretion, dry matter apparent digestibility, pH and dietary fiber apparent digestibility and its insoluble and soluble fractions were assessed. The evaluated treatments did not show any significant difference concerning dry fiber daily average consumption, weight gaining, dietary conversion and dry matter apparent digestibility. The diets with higher content of soluble fiber increased the fecal excretion and total and soluble fiber apparent digestibility, while the diet with high content of insoluble fiber reduced the pH value of the feces and increased the insoluble fiber apparent digestibility. The results obtained allow to fundament the use of different oat grains cultivars for specific ends in human nutrition.