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Effects of the type and level of dietary fibre supplements on nitrogen retention and excretion patterns

Published online by Cambridge University Press:  09 March 2007

Inge Tetens ,
G. Livesey  and
B. O. Eggum
Inge Tetens
Affiliation:
National Institute of Animal Science, Department of Animal Physiology and Biochemistry, Research Centre Foulum, PO Box 39, DK-8830 Tjele, Denmark
G. Livesey
Affiliation:
Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, Norwich NR4 7UA
B. O. Eggum
Affiliation:
National Institute of Animal Science, Department of Animal Physiology and Biochemistry, Research Centre Foulum, PO Box 39, DK-8830 Tjele, Denmark
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Abstract:

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The hypothesls was tested that fermentable dietary fibre (DF) sources elevate faecal N excretion at the expense of urinary N without affecting N retention. DF that substantially increase fermentation (pectin, Sugarbeet and soya bran) or are poorly fermented (crystalline cellulose and maize bran) were fed as supplements to a basal DF-free diet a t three dose levels: 0,50 and 100 g supplement/kg basal diet. The diets were fed to juvenile male Wistar rats for 2 weeks before a 7 d period when faeces and urine were collected. Faecal excretion of N was significantly increased, dose-dependently, by all DF supplements and was positively correlated to faecal bulking. Urinary excretion of N was lower at the high doses of the DF supplements but reached significance only with the highly fermentable (0·68) sugarbeet- supplementeddiets. Regression analysis showed that the major part (0·75) of the increase in faecal N excretion due to DF supplementation was balanced by a reduction in urinary excretion; N retention was therefore, at the dose levels used, only affected to a small extent. Only in the maize-bran-supplemented diets were the reductions in N retention significant. The shift in N excretion from urine to faeces can be explained largely by the degree of microbial fermentation in the large intestine caused by the addition of DF supplements and emphasizes the modifying role that certain DF supplements may have on the enterohepatic cycle of N. Possible implications of these findings for patients with liver or renal failure or for conditions when the intake of dietary protein is marginal are discussed.

Keywords

Nitrogen retentionNitrogen excretionDietary fibre
Type
dietary fibre supplements and nitrogen metabolism
Information
British Journal of Nutrition , Volume 75 , Issue 3 , March 1996 , pp. 461 - 469
Copyright
Copyright © The Nutrition Society 1996

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