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Digestion of fibre polysaccharides of pea (Pisum sativum) hulls, carrot and cabbage by adult cockerels

Published online by Cambridge University Press:  09 March 2007

M. Longstaff  and
J. M. McNab
M. Longstaff
Affiliation:
AFRC Institute for Grassland and Animal Production, Poultry Department, Roslin, Midlothian EH25 9PS
J. M. McNab
Affiliation:
AFRC Institute for Grassland and Animal Production, Poultry Department, Roslin, Midlothian EH25 9PS
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Abstract

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Characterization of the carbohydrates of pea (Pisum sativum) hulls, carrot and cabbage using both colorimetric and gas–liquid chromatographic techniques permitted a detailed investigation into the extent of digestion of differing types of fibre. These digestion studies were greatly aided by the development of a rapid bioassay employing starved adult cockerels. Total collection of undigested residues, uncontaminated by food spillage, could be made from trays placed under the cockerels. Chemical analysis showed that pea hulls consisted mainly of fibre with very little available carbohydrate present, whereas more than half of freeze-dried carrot and cabbage consisted of available carbohydrate (sucrose, glucose, fructose, starch) and consequently considerably less fibre was present. The fibre of carrot and cabbage was similarly composed of nearly equal amounts of neutral and acidic polysaccharides, whereas pea-hull fibre had four times as much neutral as acidic polysaccharides. The digestibility of total neutral polysaccharides from all three foodstuffs was extremely low. However, there appeared to be preferential digestion of polysaccharides composed of rhamnose, arabinose and galactose residues, all associated with pectic material, in contrast to the indigestibility of polysaccharides composed of fucose, xylose and glucose. Acidic polysaccharides were digested to a greater extent than neutral ones, and those of carrot and cabbage more so than pea hulls. The polysaccharides which were the most soluble were also the most digestible, but due to the arbitrariness of polysaccharide solubility, quantification of their total digestibility per se was considered not possible.

Keywords

Fibre polysaccharidesDigestionCockerels
Type
Gastrointestinal Physiology, Digestion and Metabolism: Non-Ruminants
Information
British Journal of Nutrition , Volume 62 , Issue 3 , November 1989 , pp. 563 - 577
Copyright
Copyright © The Nutrition Society 1989

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