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  • Title: 24-hour renal clearance and excretion of endogenous substances in the mare.
    Author: Kohn CW, Strasser SL.
    Journal: Am J Vet Res; 1986 Jun; 47(6):1332-7. PubMed ID: 3729136.
    Abstract:
    Urine samples were obtained from 6 healthy mares. During a 2-day acclimation period, mares were kept in stalls, fed sweet feed and mixed grass hay, and allowed free access to water and trace mineral salt. The mares were crosstied in their stalls within reach of hay, salt, and water for 24 hours during which urine was obtained by constant flow via indwelling Foley catheters. Twenty-four-hour urine production was 7,649 to 11,904 ml/day (mean = 9,212 +/- 1,9285) or 14.7 to 25.1 mlĝ/day. (mean = 19.3 +/- 4.1). Urinary excretion and clearance of electrolytes and protein were determined from aliquots of well-mixed, pooled 24-hour urine samples. These values were sodium (Na) = 0 to 1.7 mEq/kg/day (mean = 0.4 +/- 0.7), chloride (Cl) = 2.0 to 4.2 mEq/kg/day (mean = 3.0 +/- 0.8), phosphorous (P) = 0.03 to 0.12 mg/kg/day (mean = 0.07 +/- 0.3), potassium (K) = 3.7 to 6.5 mEq/kg/day (mean = 5.3 +/- 1.4), and creatinine (Cr) = 32.1 to 53.9 mg/kg/day (mean = 40.3 +/- 8.5). Fractional excretions of electrolytes were Na = 0% to 0.46% (mean = 0.1 +/- 0.2), Cl = 0.48% to 1.64% (mean = 1.14 +/- 0.45), P = 0.04% to 0.16% (mean = 0.08 +/- 0.04), and K = 23.9% to 75.1% (mean = 51.7 +/- 17.3). Average clearances (ml/hr/kg) were Na = 0.12 +/- 0.19, K = 64.1 +/- 17.1, Cl = 1.21 +/- 0.33, and P = 0.09 +/- 0.51. Average endogenous Cr clearance (ml/min/kg) was 1.92 +/- 0.51.(ABSTRACT TRUNCATED AT 250 WORDS)
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