High dietary salt (NaCl) concentrations are assumed to be
beneficial in preventing formation of calcium oxalate (CaOx) uroliths in cats,
since increased water intake and urine volume have been observed subsequent to
intake. The aim of this study was to clarify the role of dietary NaCl in the
formation of CaOx uroliths in cats.
Eight cats received four diets that differed in Na and Cl
concentrations. Each feeding period consisted of a 21-day adaptation period,
followed by a seven-day sampling period for urine collection. Higher dietary
NaCl concentrations were associated with increased urine volume and Na
excretion. Urinary Ca concentration was constant, but renal Ca excretion
increased from 0.62 to 1.05 mg/kg bodyweight (BW)/day with higher dietary NaCl
concentrations. Urinary oxalate (Ox), citrate, P and K concentrations decreased
when NaCl intake was high, and urinary pH was low in all groups. Relative
supersaturation of CaOx in the urine was unaffected by dietary NaCl concentrations.
In conclusion, the present study demonstrated several
beneficial effects of high dietary NaCl intake over a relatively short time
period. In particular, urinary Ca concentration remained unchanged because of
increased urine volume.
Paßlack et al., 2014. Short term
effects of increasing dietary salt concentrations on urine composition in
healthy cats. Br Vet J online, April
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