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Statistical Analysis of Blood Serum Composition, Urine Excretion Levels and the Occurrence of Urolithiasis in Sheep¹

Texas A&M University and U.S. Department of Agriculture, College Station

Abstract

Discriminant analysis based upon blood serum levels of inorganic phosphorus, total serum calcium, magnesium and potassium and urine excretion values for 24 hr. volume, specific gravity, pH, titratable acidity, total calcium, magnesium, phosphorus and potassium has been used to predict urolithiasis in sheep. Data collected between 29 and 56 days on test (period 2) could be used for the prediction equation. Using these 12 variables, the equation is approximately 75% accurate in classifying the sheep as uroliths or non-uroliths.

¹ The authors wish to acknowedge the help and advice given by Dr. H. O. Hartley, Director of the Graduate Institute of Statistics.

² Present address, Department of Plant Science, Texas A&M University, College Station.

³ A portion of the data was taken from a thesis in partial fulfillment of the requirement for the M.S. degree at Texas A&M University, College Station.

⁴ Institute of Statistics, Texas A&M University, College Station.

⁵ Animal Husbandry Research Division, A.R.S., U.S.D.A. and Departments of Biochemistry and Biophysics and of Animal Science, Texas Agricultural Experiment Station, College Station.