J. Anim Sci.
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J. Anim Sci. 1970. 30:15-20.
© 1970 American Society of Animal Science
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Biological and Technical Sources of Variability in Bovine Carcass Lean Tissue Composition I. Technical Variation in Measurement of Potassium, Nitrogen and Water1, 2,

T. G. Lohman, R. C. Dieter and H. W. Norton

University of Illinois, Urbana-Champaign

Abstract

Biological variation in tissue chemical composition on a fat-free and fat-free dry-matter basis has implication in several fields of biology. This knowledge is particularly important in body composition studies, because many methods of predicting various components of the body are based on the assumption of a constant fat-free body composition.

The difficulty of quantifying biological variation, i.e., differences among animals within breed group and treatment, is that measurement errors also afflict each datum. Coefficients of variation in tissue potassium, nitrogen and water concentration, constituents which are of particular interest to body composition workers, usually have not been separated into biological and technical components. Error analysis is an essential part of any study of biological variation.

This study examines technical variation in the measurement of potassium, nitrogen and water in the total lean muscle mass of steer carcasses.

Seven cuts constituting the entire boneless, trimmed, right side from each of 98 steer carcasses were each sampled once and analyzed in duplicate for ether-extractable materials, N and H2O, within 1 year after samples were collected (Lohman and Norton, 1968), and for K after about 3 years.

Footnotes

1 Supported jointly by funds from the U.S.D.A. and the Department of Animal Science, University of Illinois.

2 Department of Animal Science.






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Copyright © 1970 by the American Society of Animal Science.