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Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden
The influence of added wheat bran or dried sugar-beet pulp on the apparent digestion of dietary components was examined in pigs fitted with duodenal and terminal ileal cannulas. The pigs were fed a basal cereal-based diet alone or substituted at a level of 33% by wheat bran or beet pulp. Neither fibrous component influenced the digestibility of starch, but inclusion of beet pulp decreased dry matter content and digestibility of ash, protein and fat in the ileum and fecal digestibility of fat. Between 11 and 37% of the nonstarch polysaccharides were degraded anterior to the ileum, and the percentage of beet pulp diet nonstarch polysaccharides that was soluble increased from 11% in the feed to 35% at the ileum. Xylose and glucose were the least degraded nonstarch polysaccharide residues in all three diets, and the non-starch polysaccharide residues varied in susceptibility to breakdown within and between diets, depending on the composition of the fiber. Almost 50% of the beet pulp, but less than 20% of the wheat bran, was degraded in the large intestine. The inclusion of wheat bran and beet pulp increased fecal output by 127 and 56%, respectively.
KEY WORDS: • dietary fiber • digestibility • pigs • wheat bran • sugar-beet pulp
1 Financially supported by the Swedish Council for Forestry and Agricultural Research.
2 A preliminary report of this work was presented at the 3rd International Seminar on Digestive Physiology in the Pig. Copenhagen, Denmark, 16–18 May, 1985. Report 580, National Institute of Animal Science, Copenhagen, pp. 195–198.
Manuscript received 21 June 1985. Revision accepted 21 October 1985.
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