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The influence of dietary fibre on body composition, visceral organ weight, digestibility and energy balance in rats housed in different thermal environments

Published online by Cambridge University Press:  09 March 2007

Xinquan Zhao ,
Henry Jørgensen  and
Bjørn O. Eggum
Xinquan Zhao
Affiliation:
National Institute of Animal Science, Department of Animal Physiology and Biochemistry, Research Centre Foulum, PO Box 39, DK-8830 Tjele, Denmark
Henry Jørgensen
Affiliation:
National Institute of Animal Science, Department of Animal Physiology and Biochemistry, Research Centre Foulum, PO Box 39, DK-8830 Tjele, Denmark
Bjørn 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 present study was undertaken to provide detailed information on the effect of dietary fibre (DF) level on body composition, visceral organ weight, nutrient digestibility and on energy and protein metabolism of rats housed in cold (16°), warm (24°) or hot (32°) thermal environments. High- or low-fibre diets (257 v. 56 g DF/kg dry matter (DM)) were studied in a 6-week balance experiment (initial body weight about 100 g). Heat production was measured using open-air circuit respiration chambers. Pea fibre and pectin were used to adjust the DF level in the high-fibre diet. The ranking order of daily gain of rats kept in different environments was: 24°>16°>32°, while the ranking order for carcass protein was: 16°>24°>32°. Rats on the high-DF diet had a lower daily gain than those on the low DF diet, and more protein in DM of empty body weight (EBW) and less fat. The relative weights (g/kg EBW) of liver, heart and kidney decreased when increasing the environmental temperature. The relative weight of the heart was highest in rats on the high DF level, while liver and kidney weights were unaffected by DF. Per kg EBW, the stomach, small intestine, caecum and colon and the length of colon were significantly greater in rats consuming the high-fibre diet compared with those on the low-fibre diet. Rats kept at low temperature had a significantly heavier gastrointestinal (GI) tract than those kept at the highest temperature. Digestibility of protein, DM and energy was lowest for rats fed on the high-fibre diet. Heat production (HP) of fed rats as well as fasting HP decreased significantly as environmental temperature increased. HP as a proportion of metabolizable energy (ME) was significantly lower for rats at 24° compared with the other environmental temperatures. The proportion of energy retained as protein was slightly higher in rats fed on the high-fibre than on the low-fibre diet. Based on the results of the present study the authors measured a net energy value of 5·4 kJ/g DF fermented; approximately 50% of the DF came from peas. Possible implications of the present findings are discussed.

Keywords

Visceral organsGutfillHeat incrementNon-starch polysaccharides
Type
Dietary fibre and energy metabolism in rats
Information
British Journal of Nutrition , Volume 73 , Issue 5 , May 1995 , pp. 687 - 699
Copyright
Copyright © The Nutrition Society 1995

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