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Variation in Potassium and Sodium Content of Bovine Muscles^{1, 2, 3,}

Michigan State University, East Lansing

Abstract

Significant differences existed in the potassium and sodium concentration among various steer muscles on a wet basis, on a fat-free, moisture-free basis and on a protein basis. Variations as high as 12.91% occurred in the potassium concentration of muscles when means were compared. Variation in the potassium content of different muscles indicated that constancy does not exist in the potassium-muscle relationship, and therefore suggests that this may be an important source of error in the K⁴⁰ method for estimating composition. Although breed differences occurred, the percent decrease was small and indicated that variation between breeds was of little consequence to the potassium-muscle relation-ship with the sample used in this study. A high degree of variation occurred among muscles in their sodium concentration, which suggests that the relationship of sodium to composition is even more inconsistent than the relationship for potassium. Data are also presented on the fat, protein and moisture content for the eight muscles studied.

¹ Journal Article 3847, Michigan Agricultural Experiment Station, East Lansing.

² The authors acknowledge the financial assistance of the Nutrition Foundation, Inc., 99 Park Ave., New York, N. Y., for providing a grant-in-aid for this study.

³ Departments of Food Science and Animal Husbandry.