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Lamb Carcass and Live Lamb Evaluations by Potassium-40 and Carcass Measurements^1,2,3,

Purdue University, Lafayette, Indiana

Abstract

Evaluations of lamb carcasses by weights, measurements, and potassium-40 analyses permitted the comparison of the methods on the basis of edible portion, excess fat, and bone constituents. Potassium-40 measurements were shown to be highly significantly related to the edible portion, excess fat, and bone composition of the carcasses. Measurements of longissimus dorsi area and external fat thickness were also highly significantly related to edible portion and excess fat proportions.

In live lambs, the correlations between potassium-40 activity and percent edible portion were significant in one of four cases. Potassium-40 correlations with percent excess fat ranged from –.72 to –.89. Longissimus dorsi area and fat thickness carcass measurements were highly significantly related to edible portion and excess fat percentages of live weight.

¹ Contribution from the Department of Animal Sciences and Department of Bionucleonics, Journal Paper No. 2033, Purdue University, Lafayette, Indiana.

² Data from the thesis submitted by M.D. Judge to the faculty of Purdue University in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

³ Supported in part by NIH Research Grant A5551 (C1), and the Medical Research Branch, Division of Biology and Medicine, Atomic Energy Commission, Contract No. AT (11–1)–876.