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Excretion of purine derivatives by ruminants: endogenous excretion, differences between cattle and sheep

Published online by Cambridge University Press:  09 March 2007

X. B. Chen ,
E. R. Ørskov  and
F. D. DeB. Hovell
X. B. Chen
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
F. D. DeB. Hovell
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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The endogenous urinary excretion of the purine derivatives allantoin, uric acid and xanthine plus hypoxanthine were measured in twenty-nine lambs, ten cattle (six steers, one cow and three preruminant calves) and four pigs. The sheep and mature cattle were nourished by intragastric infusion and the calves were given a milk-substitute. The pigs were fed on a purine-free diet. The excretion of total purine derivatives was substantially greater by the cattle, being 514 (se 20.6) μmol/kg live weight (W)0·75 per d compared with 168 (se 5·0) μmol/kg W0·75 per d by the sheep and 166 (se 2·6) μmol/kg W0·75 per d by the pigs. Plasma from normally fed sheep, cows and pigs was incubated with either xanthine or uric acid. Sheep and pig plasma had no xanthine oxidase (ec 1. 2. 3. 2) activity whereas plasma from cattle did. Uricase (ec 1. 7. 3. 3) was not present in plasma of cattle and pigs and appeared to be present in trace amounts only in sheep plasma. It is suggested that the species differences in endogenous purine derivative excretion were probably due to the different profiles of xanthine oxidase activity in tissues and particularly in the blood. This is because a high xanthine oxidase activity in tissues and particularly in the blood. This is because a high xanthine oxidase activity would reduce the chance to recycle purines, by increasing the probability of degradation to compounds which could not be salvaged.

Keywords

Purine derivativesUricaseXanthine oxidaseCattleSheep
Type
Metabolism in Ruminants
Information
British Journal of Nutrition , Volume 63 , Issue 1 , January 1990 , pp. 121 - 129
Copyright
Copyright © The Nutrition Society 1990

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