J. Anim Sci.
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J. Anim Sci. 1970. 30:36-39.
© 1970 American Society of Animal Science
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M. Longissimus Area of Lamb Carcasses—A Comparison of Four Measurement Techniques and the Evaluation of Operator Differences1, 2,

R. E. Rust, D. G. Olson, D. D. Kratzer3, R. O. Schuler4 and R. L. Vetter

Iowa State University, Ames

Abstract

The cross-sectional area of the longissimus is frequently used as a measure of carcass lean or an expression of carcass desirability. Ament, Galgan and Rupnow (1962) reported a correlation of 0.8 between longissimus area and carcass lean in lamb carcasses. Field, Kemp and Varney (1963); Latham, Moody and Kemp (1966) and Smith and Galgan (1964) used the longissimus area as a variable in prediction equations of carcass lean and the yield of retail salable meat.

Thus, it is important that longissimus area be measured accurately and rapidly so that large numbers of carcasses can be evaluated. Longissimus area has traditionally been measured from a tracing with a compensating polar planimeter or by superimposing a grid over the tracing as reported by Bodwell, Harrington and Pomeroy (1959) and Henderson et al. (1966). A photographic method of measuring the longissimus area was introduced by Schoonover and Stratton (1957) who suggested that this method was subject to less operator error.

Footnotes

1 Journal Paper No. J-6193 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1566.

2 Cooperation of Wilson and Company, Cedar Rapids, Iowa, is gratefully acknowledged.

3 Departments of Animal Sciences and Statistics, University of Kentucky, Lexington.

4 Department of Animal Science, University of Nebraska, Lincoln.






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