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The effect of protein infusion on urinary excretion of purine derivatives in ruminants nourished by intragastric nutrition

Published online by Cambridge University Press:  27 March 2009

T. Fujihara ,
E. R. Ørskov ,
P. J. Reeds  and
D. J. Kyle
T. Fujihara
Affiliation:
The Rowelt Research Institute, Bucksburn, Aberdeen, AB2 9SB
E. R. Ørskov
Affiliation:
The Rowelt Research Institute, Bucksburn, Aberdeen, AB2 9SB
P. J. Reeds
Affiliation:
The Rowelt Research Institute, Bucksburn, Aberdeen, AB2 9SB
D. J. Kyle
Affiliation:
The Rowelt Research Institute, Bucksburn, Aberdeen, AB2 9SB
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Summary

Two experiments were carried out to determine endogenous excretion of purine derivatives in steers and lambs, and to investigate the relationship between microbial nucleic acid input and urinary excretion of purine nitrogen.

The endogenous excretion of allantoin after conversion of hypoxanthine, xanthine and uric acid to allantoin, was calculated to be 72 and 26 mg/kg W0·75 per day in steers and lambs, respectively, when the dietary protein contained no nucleic acid nitrogen.

The excretion of purine derivatives increased linearly with increasing microbial nucleic acid input in lambs. The excretion of purine derivatives in excess of endogenous contribution was closely related to the theoretically expected values. The average recovery was calculated as 0·96 for one sheep and 1·0 for the other.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 109 , Issue 1 , August 1987 , pp. 7 - 12
Copyright
Copyright © Cambridge University Press 1987

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