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Purine derivatives in spot urine samples and plasma of sheep: a possible index of microbial protein supply

Published online by Cambridge University Press:  24 November 2017

X. B. Chen ,
Adriana T. Mejia ,
D. J. Kyle  and
E. R. Ørskov
X. B. Chen
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB.
Adriana T. Mejia
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB.
D. J. Kyle
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB.
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB.
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Extract

In ruminants, daily urinary excretion of purine derivatives (PD) reflects the absorption of microbial purines and can be used as an index of microbial protein supply (Chen, Ørskov and Hovell, 1991). The application could be extended to farm conditions if measurements based on spot urine samples or plasma could serve as an alternative index. The objective of this study was to examine whether PD concentrations in spot urine or plasma samples vary diurnally during a given feeding regime and if they reflect differences in daily PD excretion induced by varying feed intake.

Type
Ruminant Protein Metabolism
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1993: Winter meeting , March 1993 , pp. 5
Copyright
Copyright © The British Society of Animal Production 1993

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References

Chen, X.B., Grubic, G., Ørskov, E.R. and Osuji, P. 1992. Effect of feeding frequency on diurnal variation in plasma and urinary purine derivatives in steers. Animal Production 55: 185–191.Google Scholar
Chen, X.B., Ørskov, E.R. and Hovell, F.D.DeB. 1991. The use of intragastric infusion in studies on excretion of purine derivatives as a measure of microbial protein supply in ruminants. Proceedings of the 6th International Symposium on protein metabolism and nutrition. Vol 2. pp.67–70.Google Scholar