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Variation in Potassium and Sodium in Muscles of the Pig^1,2,

Michigan Agricultural Experiment Station, East Lansing

Abstract

Significant differences exist in potassium and sodium content among various muscles of the pig on a wet basis, a fat-free, moisture-free basis and on a protein basis. Variations as high as 34.7% occurred in potassium per kilogram of muscle when extreme values were compared. Significant differences in sodium and potassium existed between breeds. The Hampshires contained more potassium and less sodium than Yorkshires on a per unit basis. Variation in the potassium content of different breeds and in different muscles indicates that constancy does not exist in the potassium-muscle ratio, and further suggests that this is an important source of error in the K⁴⁰ method of estimating composition.

¹ Journal article 3354, Michigan Agricultural Experiment Station, East Lansing, Michigan.

² This investigation was supported in part by Public Health Service Grant AM 04172-02 from the National Institute of Arthritis and Metabolic Diseases.

³ Present address: Ruakura Animal Research Station, Private Bag, Hamilton, New Zealand.