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Increasing Calcium Intakes Lower Urinary Concentrations of Phosphorus and Magnesium in Adult Ovariectomized Cats^1,2,

F.J.H. Pastoor^*,3, A. Th. Van 'T Klooster, J.N.J.J. Mathot^* and A. C. Beynen^*,

^* Department of Laboratory Animal Science Department of Large Animal Medicine and Nutrition, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands

The effect of dietary calcium level on the fecal and urinary excretion of calcium, phosphorus and magnesium was studied in adult cats. Ovariectomized cats were fed purified diets containing 3.2, 4.8, 9.5 or 19.3 mmol calcium/MJ in a 4 x 4 wk crossover study. During the experiment, balance studies were performed and blood samples were taken. The adult ovariectomized cats maintained calcium balance at all four levels of calcium tested. Extra dietary calcium, in the form of CaCO₃, caused a slight increase in urinary pH. Urinary concentrations of phosphorus and magnesium dropped, but that of calcium remained unchanged, when the cats were fed diets with increasing calcium levels. The percentages of apparent absorption of phosphorus and magnesium fell when calcium intake was raised. The dietary calcium level did not affect plasma concentrations of calcium, magnesium and phosphorus or plasma activity of alkaline phosphatase.

KEY WORDS: • calcium • mineral excretion • urolithiasis • cats

¹ F.J.H. Pastoor was supported by Rodi b.v., Opmeer, The Netherlands.

² The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 USC section 1734 solely to indicate this fact.

³ To whom correspondence should be addressed.

Manuscript received 19 May 1993. Revision accepted 13 October 1993.