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Effect of dietary magnesium level on urinary and faecal excretion of calcium, magnesium and phosphorus in adult, ovariectomized cats

Published online by Cambridge University Press:  09 March 2007

F. J. H. Pastoor ,
A. Th. Van Tklooster ,
R. Opitz  and
A. C. Beynen
F. J. H. Pastoor
Affiliation:
Department of Laboratory Animal Science, Utrecht University, Utrecht, The Netherlands
A. Th. Van Tklooster
Affiliation:
Department of Large Animal Medicine and Nutrition, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
R. Opitz
Affiliation:
Department of Laboratory Animal Science, Utrecht University, Utrecht, The Netherlands
A. C. Beynen
Affiliation:
Department of Laboratory Animal Science, Utrecht University, Utrecht, The Netherlands Department of Large Animal Medicine and Nutrition, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
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Abstract

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Dietary Mg restriction is generally considered to contribute to the prevention of struvite urolithiasis in cats, but its effects on faecal and urinary excretion of Ca and P have not been systematically investigated. The present study seeks to fill the gap. In a 4×4-week crossover study, ovariectomized cats were fed on purified diets containing either 0·40, 0·79,1·59 or 3·17 mmol Mg/MJ (0·19, 0·38,0·76 and 1·52 g Mg/kg diet). Increasing the dietary Mg level from 0·40 to 3·17 mmol Mg/MJ by the addition of extra MgCO3 raised urinary and faecal excretion of Mg from 0·14 to 0·68 mmol/MJ and from 0·28 to 1·66 mmoI/MJ respectively. The 8-fold increase in Mg intake significantly raised urinary excretion of Ca from 0·06 to respectively when the dietary Mg level was raised from 0·40 to 3·17 mmol/MJ. A dietary level of 0·40 mmol Mg/MJ (0·19 g Mg/kg diet) was found to be sufficient to maintain Mg balance in the adult ovariectomized cats fed on the purified diet.

Keywords

MagnesiumMineral excretionUrolithiasisCat
Type
Mineral metabolism in companion animals
Information
British Journal of Nutrition , Volume 74 , Issue 1 , July 1995 , pp. 77 - 84
Copyright
Copyright © The Nutrition Society 1995

References

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