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A Study of the Variations of Myoglobin Concentration in "Two-Toned" Hams¹

American Meat Institute Foundation, Chicago

W. J. Aunan

University of Minnesota, St. Paul

Abstract

In the study presented, certain muscles from center ham slices from 32 litter-mate pairs of hogs fed on a control and Aureomycin-supplemented ration were analyzed for myoglobin content. The results showed no effect of this supplementation on the myoglobin content of either the biceps femoris or a composite sample of the rectus femoris, vastus lateralis, vastus intermedius and vastus medialis. The three breeds of hogs represented in the study showed distinct differences in the myoglobin content of the latter four dark muscles. For the samples studied, the degree of "two-toning" was more closely related to the amount of myoglobin in the dark muscles than the amount of myoglobin in the light colored biceps femoris. The data suggest that the concentration of myoglobin and the degree of "two-toning" in hams are heritable characteristics. The method for determining myoglobin is decribed.

¹ Journal Paper No. 176 from the American Meat Institute Foundation.