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Effects of dietary carbohydrate composition on rumen fermentation, plasma hormones and metabolites in growing-fattening bulls

Published online by Cambridge University Press:  02 September 2010

C. van Eenaeme ,
L. Istasse ,
A. Gabriel ,
A. Clinquart ,
G. Maghuin-Rogister  and
J. M. Bienfait
C. van Eenaeme
Affiliation:
University of Liége, Veterinary Faculty, 45 rue des Vétérinaires, 1070 Bruxelles, Belgium
L. Istasse
Affiliation:
University of Liége, Veterinary Faculty, 45 rue des Vétérinaires, 1070 Bruxelles, Belgium
A. Gabriel
Affiliation:
University of Liége, Veterinary Faculty, 45 rue des Vétérinaires, 1070 Bruxelles, Belgium
A. Clinquart
Affiliation:
University of Liége, Veterinary Faculty, 45 rue des Vétérinaires, 1070 Bruxelles, Belgium
G. Maghuin-Rogister
Affiliation:
University of Liége, Veterinary Faculty, 45 rue des Vétérinaires, 1070 Bruxelles, Belgium
J. M. Bienfait
Affiliation:
University of Liége, Veterinary Faculty, 45 rue des Vétérinaires, 1070 Bruxelles, Belgium
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Abstract

Two groups of six bulls were offered a fattening diet based on barley or sugar-beet pulp in the proportions of either 500: 200 g/kg or 200: 500 g/kg to compare the effects of starch and degradable fibre on rumen fermentations, plasma hormones and metabolites. The bulls were fed twice daily at 08.00 and 16.00 h.

The large proportion of sugar-beet pulp in the diet induced higher levels of acetic and butyric acids and less propionic acid than the high proportion of barley. The diurnal patterns over a 24-h period of rumen pH, volatile fatty acids, glucose and ammonia were characterized by two cycles. Sugar-beet pulp in large proportions induced more even fermentations as indicated by flatter curves with less extreme values than those produced by a large inclusion of barley in the diet. Ammonia concentration was high before feeding and decreased subsequently during 4 to 6 h after the meal.

No typical patterns were observed in plasma concentrations of glucose and alpha-amino nitrogen. Plasma urea concentration rose 2h after feeding and dropped during the following 6 to 8 h. There were no effects of dietary carbohydrate composition on growth hormone concentration but plasma insulin was significantly reduced with the diet high in sugar-beet pulp. Furthermore, the insulin profile showed peaks after each meal with the barley diet but only after the afternoon feeding with the diet high in sugar-beet pulp.

Keywords

bullsdietary carbohydratehormonesmetabolitesrumen fermentation
Type
Research Article
Information
Animal Production , Volume 50 , Issue 3 , June 1990 , pp. 409 - 416
Copyright
Copyright © British Society of Animal Science 1990

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