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Publication type: Journal Article
Document type: Full Paper

Year: 2006

Author(s): Wagner, E; Keusch, Ch; Iben, Ch

Title: Influence of the feed base excess on urine parameters in cats.

Source: J Anim Physiol Anim Nutr (Berl). 2006; 90(1-2):19-24

Authors Vetmeduni Vienna:

Iben Christine
Wagner Elisabeth

Vetmed Research Units
Institute of Animal Nutrition and Functional Plant Compounds

In this study the base excess (BE) was used as a method to predict the influence of the food on the urinary pH on cats. Nine cat foods (six dry and three canned) were consecutively fed to eight cats. The urine pH, volume, specific gravity and water and food intake were determined daily. The base excess [BE; mmol/kg dry matter (DM)] was calculated from the compounds in the food (BE = 49.9*Ca+82.3*Mg*+43.5*Na+25.6*K-64.6*P-13.4*Met-16.6*Cys-28.2*Cl). The BE of the tested foods was between -287.35 and 133.38 mmol/kg DM. The mean urine pH varied between 5.76 (SD = 0.13) and 7.16 (SD = 0.22). The BE correlated with the mean urine pH (pH = 6.25+0.0023*BE; r = 0.74**). The urine volume (ml/kg BW/day) correlated significantly positive with the K- (r = 0.71**) and significantly negative with the P-content (r = -0.67**), the Ca-content (r = -0.50**) followed by the Mg-content (r = -0.36**) of the food. The correlation coefficients between the anions/cations in the food and the urine pH was for K 0.36**, for P -0.61**, the Met+Cys -0.60** and Cl -0.27**. In practice the correlation between urine pH and BE would help to pre-estimate the effect of food on the urine pH and to prevent urolith formation.

Keywords Pubmed: Animal Feed*
Cat Diseases/metabolism
Cat Diseases/prevention & control*
Hydrogen-Ion Concentration
Random Allocation
Specific Gravity
Urinary Calculi/metabolism
Urinary Calculi/prevention & control
Urinary Calculi/veterinary*

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