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Nutrient digestibilities in ingredients fed alone or in combinations

Published online by Cambridge University Press:  09 March 2007

Inge Hansen ,
T. Larsen ,
K. E. Bach Knudsen  and
B. O. Eggum
Inge Hansen
Affiliation:
National Institute of Animal Science, Animal Physiology and Biochemistry, Foulum, PO Box 39, 8830 Tjele, Denmark
T. Larsen
Affiliation:
National Institute of Animal Science, Animal Physiology and Biochemistry, Foulum, PO Box 39, 8830 Tjele, Denmark
K. E. Bach Knudsen
Affiliation:
National Institute of Animal Science, Animal Physiology and Biochemistry, Foulum, PO Box 39, 8830 Tjele, Denmark
B. O. Eggum
Affiliation:
National Institute of Animal Science, Animal Physiology and Biochemistry, Foulum, PO Box 39, 8830 Tjele, Denmark
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Abstract

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Digestibility coefficients (DC) of protein, dry matter, energy, starch, and dietary fibre in individual feedstuffs were used to predict the DC in feed mixtures. Digestibility studies with growing rats involved six feed sources: soya-bean meal, barley, rapeseed meal, peas, wheat bran and wheat, given individually and in various combinations, i.e. fourteen diets in total. True digestibility of protein (TD) and apparent digestibility of starch could be predicted in feed mixtures from their respective DC values for the individual ingredients, except in the diet composed of peas+barley. Dry matter (DM) and insoluble dietary fibre digestibilities in the mixtures could also be calculated from their individual DC values. Energy digestibility could be predicted in all mixtures except for barley+wheat and peas + wheat. Although the discrepancies were significant, the differences were not great. The digestibility of soluble dietary fibre in the mixtures could be predicted as for the individual ingredients in all but three diets: rapeseed meal + barley, peas + barley and peas + wheat. The results confirm that DC values for TD, DM, energy, starch and dietary fibre in mixtures can be calculated with high precision from DC determined from individual ingredients. Caution should be taken though when mixtures contain a high amount of dietary fibre, especially of the soluble type.

Keywords

ProteinStarchDietary fibreEnergy
Type
Digestibility of Nutrients
Information
British Journal of Nutrition , Volume 66 , Issue 1 , July 1991 , pp. 27 - 35
Copyright
Copyright © The Nutrition Society 1991

References

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