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The effect of forage and forage–concentrate diets on rumen fermentation and metabolism of nutrients by the mesenteric- and portal-drained viscera in growing steers

Published online by Cambridge University Press:  09 March 2007

C. J. Seal ,
D. S. Parker  and
P. J. Avery
C. J. Seal
Affiliation:
Department of Biological and Nutritional Sciences, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU
D. S. Parker
Affiliation:
Department of Biological and Nutritional Sciences, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU
P. J. Avery
Affiliation:
Department of Mathematics and Statistics, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU
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Abstract

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Growing Friesian steers chronically catheterized in the anterior mesenteric and portal veins were used to study the influence of feeding with either a forage or forage–concentrate diet on nutrient utilization by mucosal tissue. When animals were consuming the forage–concentrate diet the molar proportion of propionate in rumen fluid was significantly increased, although production rate as measured by isotope dilution was not altered. Net rates of absorption of VFA into portal blood when compared with rumen production rates underlined the extent to which metabolism within mucosal tissue modifies the propionate supply to the liver. Net glucose utilization by splanchnic tissue was shown to be significantly lower on the forage–concentrate diet. There were no effects of diet on whole-body glucose turnover or on the proportion of glucose derived from propionate. Animals fed on the forage–concentrate diet had significantly lower concentrations of circulating essential amino acids, due mainly to a reduction in branched-chain amino acid levels. There was net absorption of all amino acids by animals on both diets except for glutamate, glutamine and taurine in forage-fed animals.

Keywords

Nutrient absorptionGut tissue metabolismAmino acid uptakeSteer
Type
Metabolic Effects of Diet
Information
British Journal of Nutrition , Volume 67 , Issue 3 , May 1992 , pp. 355 - 370
Copyright
Copyright © The Nutrition Society 1992

References

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