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Intestinal degradation in pigs of rye dietary fibre with different structural characteristics

Published online by Cambridge University Press:  09 March 2007

L. V. Glitsø*
Affiliation:
Danish Institute of Agricultural Sciences, Department of Animal Nutrition and Physiology, PO Box 50, Research Centre Foulum, 8830 Tjele, Denmark Research Department of Human Nutrition, The Royal Veterinary and Agricultural University, Rolighedsvej 30, 1958 Frederiksberg C, Copenhagen, Denmark
G. Brunsgaard
Affiliation:
Danish Institute of Agricultural Sciences, Department of Animal Nutrition and Physiology, PO Box 50, Research Centre Foulum, 8830 Tjele, Denmark
S. Højsgaard
Affiliation:
Department of Agricultural Systems, PO Box 23, Research Centre Foulum, 8830 Tjele, Denmark
B. Sandström
Affiliation:
Research Department of Human Nutrition, The Royal Veterinary and Agricultural University, Rolighedsvej 30, 1958 Frederiksberg C, Copenhagen, Denmark
K. E. Bach Knudsen
Affiliation:
Danish Institute of Agricultural Sciences, Department of Animal Nutrition and Physiology, PO Box 50, Research Centre Foulum, 8830 Tjele, Denmark
*
*Corresponding author:Dr Vibe Glitsø, fax +45 8999 1378, email [email protected]
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Abstract

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In order to investigate the effects of dietary fibre (DF) characteristics on carbohydrate degradation and the metabolism in the large intestine, pigs were fed on four rye-bread diets (based on whole rye, pericarp/testa, aleurone or endosperm) with differences in characteristics and amount of DF. The degradability of DF in the large intestine varied greatly between diets. The pericarp/testa DF was hardly degraded in the large intestine, whereas endosperm DF was extensively and rapidly degraded in the caecum. Caecal degradation of aleurone DF was also limited, leaving more material to be degraded in the colon. The undegradable pericarp/testa DF was characterized by high contents of lignin, cellulose, ferulic acids and highly substituted arabinoxylans (the major DF component in rye). Ingestion of this diet resulted in increased faecal bulk and reduced transit time, but with low colonic pH and the lowest concentrations of short-chain fatty acids (SCFA). The aleurone diet, on the other hand, led to a fermentation pattern which may be considered more optimal, with lower colonic pH and higher concentrations of SCFA, in particular butyric acid. Despite the large differences in carbohydrate fermentation only minor significant effects on the presence of protein degradation products and on histological measurements (height and diameter of colonic crypts and thickness of the muscularis externa) were observed.

Type
Research Article
Copyright
Copyright © The Nutrition Society 1998

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