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Urinary phosphate excretion in the dairy cow

Published online by Cambridge University Press:  27 March 2009

R. Manston  and
M. J. Vagg
R. Manston
Affiliation:
Department of Functional Pathology, Institute for Research on Animal Diseases, Compton, Nr. Newbury, Berkshire
M. J. Vagg
Affiliation:
Department of Functional Pathology, Institute for Research on Animal Diseases, Compton, Nr. Newbury, Berkshire
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Summary

Analyses of cow urine showed that about 10% of housed cows excreted phosphate greatly in excess of ‘normal’. The phosphaturia only occurred when the cows were permanently housed. No high phosphate concentrations were found in. urines from grazing cows although a significant increase in phosphate concentrations occurred when these cows were temporarily transferred to housed conditions.

No significant differences were detected between the high and low phosphate excreting cows with respect of urinary concentrations of creatinine, calcium, or chloride, urine specific gravity or pH, or plasma concentrations of calcium, inorganic phosphate, magnesium, sodium, potassium, alkaline phosphatase, chloride or bicarbonate.

Complete phosphorus balance measurements on four cows during the last six weeks of pregnancy showed that an increase in urinary phosphate excretion occurred in both high- and low-phosphate excreting cows when a dietary 'steaming-up' schedule was employed, and that the phosphaturia was accompanied by an increase in absorption of dietary phosphorus.

The cause of the phosphaturia does not appear to be acidosis. Little change in urinary phosphorus excretion occurred after oral doses of ammonium chloride but some increase occurred after equivalent doses of sodium and potassium carbonates. It is concluded that a small proportion of cows have a tendency to excrete relatively large amounts of phosphorus in the urine but that this only occurs under housed conditions.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 74 , Issue 1 , February 1970 , pp. 161 - 167
Copyright
Copyright © Cambridge University Press 1970

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References

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