Chilean edible sea marcoalgae as sources of dietary fiber: Effect on apparent digestibility of protein, fiber, energy and fecal weight in rats.

The inclusion of algae as a source of fiber in the diet is justified by the present need to increase the intake of this nutrient. The aim of this study was to study on rats, the effect of dietary algae fiber on fecal weight and apparent digestibility of energy, protein and fiber. The type of algae studied were cochayuyo (frond) and ulte (basal part) (Durvillea antarctica), luche verde (Ulva lactuca) and luche rojo (Porphyra columbina). All these algae were boiled and dried at 55 degrees under air flow. Male rats, Wistar strain of 25 days of age, were fed during 39 days with diets containing casein plus the inclusion of 10% (weight) of one of these algae dietary fiber. A group having no fiber intake was used as a Control group. Algae content of dietary fiber ranged between 58,2 - 75,6 g/100 g (dry weight), soluble fiber portion constituted 37,9 - 52,4%. In relation to the Control group it was found significant reduction in the apparent digestibility of protein and energy, and a significant reduction in fecal weight. Dietary fiber digestibility ranged between 21,1 and 43,1%. This study shows that algae can be ii excellent dietary fiber source, very useful to prevent or treat different fiber-deficiency related diseases.