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Nitrogen digestion in forage-fed sheep with and without intraruminal propionate infusion

Published online by Cambridge University Press:  27 March 2009

C. J. Seal ,
D. S. Parker ,
J. Balcells  and
J. L. Mole
C. J. Seal
Affiliation:
Department of Biological and Nutritional Sciences, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NEl 7RU, UK
D. S. Parker
Affiliation:
Department of Biological and Nutritional Sciences, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NEl 7RU, UK
J. Balcells
Affiliation:
Department of Biological and Nutritional Sciences, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NEl 7RU, UK
J. L. Mole
Affiliation:
Department of Biological and Nutritional Sciences, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NEl 7RU, UK
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Summary

Nitrogen balance and flow of nitrogen along the gastrointestinal tract were determined in growing wether sheep fed a dried grass pellet diet with or without intraruminal propionic acid infusion. Plasma free amino acid and glucose concentrations tended to be higher in peripheral blood of animals receiving propionate (P < 0·10). Overall total nitrogen and amino acid digestibilities and apparent digestibilities of each fraction along the digestive tract were not affected by infusion of propionic acid. The contribution of microbial amino acids to total amino acid flow in the duodenum measured using purine bases as the microbial marker averaged 0·49 and was not affected by propionic acid infusion. It is suggested that changes in circulating amino acid levels arise from reduced utilization of luminal amino acids by gastrointestinal tissues due to the increased availability of alternative energy-yielding substrates.

Type
Animals
Information
The Journal of Agricultural Science , Volume 120 , Issue 1 , February 1993 , pp. 107 - 114
Copyright
Copyright © Cambridge University Press 1993

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