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Effect of defaunation on protein and fibre digestion in sheep fed on ammonia-treated straw-based diets with or without maize

Published online by Cambridge University Press:  09 March 2007

K. Ushida ,
C. Kayouli ,
S. De Smet  and
J. P. Jouany
K. Ushida
Affiliation:
Station de Recherches sur la Nutrition des Herbivores, Unité de la Digestion Microbienne, INRA, Centre de Recherches de Clermont Ferrand-Theix, 63122 Ceyrat, France
C. Kayouli
Affiliation:
Station de Recherches sur la Nutrition des Herbivores, Unité de la Digestion Microbienne, INRA, Centre de Recherches de Clermont Ferrand-Theix, 63122 Ceyrat, France
S. De Smet
Affiliation:
Station de Recherches sur la Nutrition des Herbivores, Unité de la Digestion Microbienne, INRA, Centre de Recherches de Clermont Ferrand-Theix, 63122 Ceyrat, France
J. P. Jouany
Affiliation:
Station de Recherches sur la Nutrition des Herbivores, Unité de la Digestion Microbienne, INRA, Centre de Recherches de Clermont Ferrand-Theix, 63122 Ceyrat, France
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Abstract

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Using a defaunating method which preserved bacteria and fungi in the rumen, the effect of protozoa on protein and fibre digestion was studied in six adult wethers in relation to the nature of the diet. Sheep were given daily, 42 g dry matter (DM)/kg metabolic body-weight (W0.75), one of two isonitrogenous diets: one contained ammonia-treated wheat straw as the only energy source (diet S) and the other was supplemented with maize grain pellets (diet SM). Mean daily intakes (g/d) of nitrogen, neutral-detergent fibre and acid-detergent fibre were respectively 22, 573 and 373 for diet S and 23, 450 and 334 for diet SM. Elimination of protozoa increased duodenal non-ammonia-nitrogen flow. This result was mainly due to an increase in microbial protein flow and, to a lesser extent, to a higher dietary protein flow. Defaunation markedly increased the efficiency of microbial protein synthesis. Maize-grain supplementation had a net positive effect on this variable in defaunated sheep, but not in faunated sheep. Cell-wall carbohydrates were less well digested in the defaunated rumen, and the negative effect of defaunation was greatest with the diet SM. Intestinal fibre digestion increased in the defaunated sheep especially in those fed on diet SM, but not enough to compensate for the decrease in rumen digestion.

Keywords

ProtozoaFibre digestionProtein digestionSheep
Type
Protein and Fibre Digestion in the Rumen
Information
British Journal of Nutrition , Volume 64 , Issue 3 , November 1990 , pp. 765 - 775
Copyright
Copyright © The Nutrition Society 1990

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