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What's Evaluated??. Last Rib BackFat (LRBF)Visual Evaluation 10th Rib BackfatAdjustment from LRBF USDA Muscle Score (MS)Grade = (4 * LRBF) - MS . Johnson, 1997. What's Evaluated??. Loin Eye Area (LEA)Estimate using live weight % MuscleCalculation using:Live weight10th rib backfatLEA. John
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