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Ovine Urinary Calculi and Pelleted Rations

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

Abstract

Pelleting a mixed diet known to be calculogenic increased (P<.001) the calculogenicity of the diet when fed to wether lambs. In a single test a pelleted, noncalculogenic diet had no effect on the incidence of calculi or on feed consumption, but did increase gain and feed efficiency. Pelleting appeared to decrease feed consumption and gain of the calculogenic diet.

Lambs fed pelleted diets had an increased incidence of calculi, a decreased concentration of urinary magnesium and potassium and an increased level of urinary phosphorus excretion when compared to urine from lambs fed the corresponding diet in meal form. Where the incidence was the same of where no calculi were observed for both the pellet and meal forms of the diet, the mineral levels in the urine were essentially the same.

¹ Beef Cattle Research Branch and Sheep and Fur Animal Research Branch, Animal Husbandry Research Division, ARS, College Station, Texas.

² Present address: Department of Biochemistry, Purdue University, Lafayette, Indiana.

³ A portion of the data was taken from a dissertation submitted to Texas A&M University in partial fulfillment of the requirements for the Ph.D. degree.

⁴ Departments of Biochemistry and Nutrition and of Animal Husbandry, Texas Agricultural Experiment Station, College Station, Texas.