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Revised Approaches to Estimate Lean of Pork Carcasses of Known Age or Days on Test^{1, 2,}

Iowa State University, Ames 50011

Abstract

Carcass measurements for 185 market hogs representing two sexes and four body types, slaughtered at 91 to 132 kg, were examined as predictors of carcass composition. Dependent variables included weight of fat-standardized lean (FSL), percentage FSL in the standardized side, weight of FSL gained/day on test, and weight of FSL produced/day of age. The greatest degree of predictive accuracy in each equation occurred when longissimus muscle area and fat depth at the three-fourths location at the 10th rib were included as independent variables. Other important variables were hot carcass weight in the three equations predicting weight for FSL, age in the equation for FSL produced/ day of age, and initial weight on test and days on test for the prediction of FSL gained/day on test. Less accuracy was found when other back-fat thickness measurements or subjective scores of muscling or fatness were used as independent variables.

¹ Journal paper No. J-10812 of Iowa Agr. and Home Econ. Exp. Sta., Ames, IA. Project 1901.

² The authors appreciate the financial support of the National Pork Producers Council and the cooperation of Oscar Mayer and Co., Inc., and Bettcher Industries, Inc.

³ Dept. of Meat and Anim. Sci., Univ. of Wisconsin, Madison, WI.

⁴ Roman L. Hruska U.S. Meat Animal Research Center, AR-SEA, USDA, Clay Center, NE.

⁵ National Pork Producers Council, Des Moines, IA.

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