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Relationship between Longissimus Muscle Area and Live Weight in Swine^1,2,

Kansas State University, Manhattan

Abstract

Data from 3,024 barrows were used to examine the relationship between loin eye area and live weight, within the live weight range 82.0 to 110.0 kilograms. Barrows were divided into two groups, one group with adjusted live weight and the other group with actual live weight. Results were similar for the two groups, although the relationship between loin eye area and live weight was closer in the adjusted group. The adjustment of 0.14 cm² per kilogram live weight approximates those derived in this study. These adjustments were for barrows only and most likely would not be the same as those for gilts and boars. Its derivation involved use of the logarithm of loin eye area and, thereby accounted for differential rates of loin eye area growth as influenced by area magnitude.

¹ Contribution No. 378, Department of Animal Science and Industry, Kansas Agricultural Experiment Station, Manhattan 66502.

² Appreciation is expressed to the University Grants Program of Farmland Industries, Inc. The authors extend their gratitude to Dr. L. F. Tribble, for his assistance. Appreciation is also expressed to Mr. Karl Faidley, Mr. Keith Leavitt, Dr. B. B. Breidenstein, Mr. Carroll Plager and Mr. Bernard Ebbing for their cooperation in obtaining data.

³ Present address: U.S.D.A., A.R.S., Data Systems Application Division, % NAL, Route 1, Beltsville, Maryland 20705.