Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle

Autor: Ameer A. Megahed, Walter Grünberg, Peter D. Constable
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Journal of Veterinary Internal Medicine, Vol 33, Iss 3, Pp 1530-1539 (2019)
Druh dokumentu: article
ISSN: 1939-1676
0891-6640
DOI: 10.1111/jvim.15502
Popis: Abstract Background Urine concentration (UC) provides clinically useful information concerning hydration status and renal function of animals. Objectives To characterize the clinical performance of urine specific gravity measured by optical refractometry (USG‐R) or Multistix‐SG urine reagent dipstick (USG‐D), urine electrical conductivity using an OAKTON Con 6 conductivity handheld meter (UEC), urine color (UColor) using a custom‐designed 8‐point color chart, and urine creatinine concentration (UCreat) for assessing UC in dairy cattle. Animals 20 periparturient Holstein‐Friesian cows. Methods Urine was obtained by perineal stimulation or urethral catheterization and urine osmolality (UOsm, reference method), USG‐R, USG‐D, UEC, UColor, and UCreat determined. Diagnostic test performance was evaluated using Spearman's rho and logistic regression to determine the area under the receiver operating curve (AUC) and optimal cut point for diagnosing hypohydration (UOsm ≥800 mOsm/kg). P
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