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Statistical Analysis of Dietary Mineral Intake and the Occurrence of Urolithiasis in Sheep

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

Abstract

A multiple regression analysis based on the dietary mineral intake has been used to predict the percent of urolithiasis in sheep. The percent of uroliths is the sum of the clinical cases and those animals having uroliths in the urinary tract at the time of slaughter but which were marketable animals. However, this type of analysis does not seem to be of great accuracy for the prediction of mortality due to urolithiasis.

Multiple regression analysis has shown that potassium exerts a curvilinear effect upon urolith formation which may help explain inconsistencies which have been observed in past work.

¹ Present address: Department of Plant Science, Texas A&M University, College Station.

² A portion of the data was taken from a thesis in partial fulfillment of the requirements for the M.S. degree at Texas A&M University, College Station.

³ Institute of Statistics, Texas A&M University, College Station.

⁴ 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.

⁵ The authors wish to acknowledge the help and advice given by Dr. H. O. Hartley, Director of the Graduate Institute of Statistics.