Abstract
ABSTRACTThe effects of various fibers on transit time, jejunal histology, and fecal excretion of nitrogen and five trace elements were determined in rats. Cellulose, microcrystalline cellulose, pectin, soy fiber, and wheat bran were fed at l%, 5%, lo%, and 15% dietary levels based on neutral detergent fiber (NDF) analysis. Transit times varied significantly for both fiber type (P < 0.01) and level (P < 0.05). Jejunal histology showed that macrovilli surface area increased with longer exposure to the fiber and with a higher level fed. There was no effect of fiber level on mineral excretion and only a few general trends with regard to effects of fiber type. It is suggested that dietary fiber fractions other than those determined by NDF analysis influence cation exchange of minerals in the gut.
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