Objective—To assess the effect of dietary potassium
citrate supplementation on the urinary pH, relative
supersaturation of calcium oxalate and struvite
(defined as the activity product/solubility product of the
substance), and concentrations of magnesium, ammonium,
phosphate, citrate, calcium, and oxalate in dogs.
Animals—12 healthy adult dogs.
Procedure—Canned dog food was fed to dogs for 37
days. Dogs were randomly allocated to 3 groups and
fed test diets for a period of 8 days. Study periods
were separated by 6-day intervals. During each study
period the dogs were fed either standard diet solus
(control) or standard diet plus 1 of 2 types of potassium
citrate supplements (150 mg potassium citrate/kg
of body weight/d) twice daily. Urinary pH, volume and
specific gravity, relative supersaturation of calcium
oxalate and struvite, and concentrations of magnesium,
ammonium, phosphate, calcium, oxalate, and
citrate were assessed for each treatment.
Results—Mean urine pH was not significantly affected
by dietary potassium citrate supplementation,
although urine pH did increase by 0.2 pH units with
supplementation. Diets containing potassium citrate
maintained a higher urine pH for a longer part of the
day than control diet. Three Miniature Schnauzers had
a significantly lower urinary relative calcium oxalate
supersaturation when fed a diet supplemented with
potassium citrate, compared with control diet.
Conclusions and Clinical Relevance—Dietary
potassium citrate supplementation has limited
effects on urinary variables in most healthy dogs,
although supplementation results in maintenance of a
higher urine pH later in the day. Consequently, if supplementation
is introduced, dogs should be fed twice
daily and potassium citrate should be given with both
meals or with the evening meal only. (Am J Vet Res 2000;61:430–435)
Objective—To determine accuracy of the use of triaxial accelerometry for measuring daily activity as a predictor of maintenance energy requirement (MER) in healthy adult Labrador Retrievers.
Animals—10 healthy adult Labrador Retrievers.
Procedures—Dogs wore an accelerometer for two 2-week periods, with data on daily activity successfully collected for 24 to 26 days. These data, along with body weight, were used as independent variables in a multiple linear regression model to predict the dependent variable of daily MER. The predictive accuracy of the model was compared with that of a model that excluded activity. Dietary energy intake at a stated amount of body weight stability was used as an equivalent measure of MER in these analyses.
Results—The multiple linear regression model that included body weight and daily activity as independent variables could be used to predict observed MER with a mean absolute error of 63.5 kcal and an SE of estimation of 94.3 kcal. Removing activity from the model reduced the predictive accuracy to a mean absolute error of 129.8 kcal and an SE of estimation of 165.4 kcal.
Conclusions and Clinical Relevance—Use of triaxial accelerometers to provide an independent variable of daily activity yielded a marked improvement in predictive accuracy of the regression model, compared with that for a model that used only body weight. Improved accuracy in estimations of MER could be made for each dog if an accelerometer was used to record its daily activity.