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Swine Evaluation

Swine Evaluation. Developed by: Celina Johnson University of Florida. What’s Evaluated??. Last Rib BackFat (LRBF) Visual Evaluation 10th Rib Backfat Adjustment from LRBF USDA Muscle Score (MS) Grade = (4 * LRBF) - MS. Johnson, 1997. What’s Evaluated??. Loin Eye Area (LEA)

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Swine Evaluation

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  1. Swine Evaluation Developed by: Celina Johnson University of Florida

  2. What’s Evaluated?? • Last Rib BackFat (LRBF) • Visual Evaluation • 10th Rib Backfat • Adjustment from LRBF • USDA Muscle Score (MS) • Grade = (4 * LRBF) - MS Johnson, 1997

  3. What’s Evaluated?? • Loin Eye Area (LEA) • Estimate using live weight • % Muscle • Calculation using: • Live weight • 10th rib backfat • LEA Johnson, 1997

  4. Evaluating for Fat • Where to evaluate? Jowl Forerib Shoulder Blade Elbow Pocket Loin Edge Flank Tailhead Seam of Ham Johnson, 1997

  5. Evaluating for Fat Johnson, 1997

  6. Evaluating for Muscle • Where to Evaluate? Shoulder Forearm Loin Stifle Ham Johnson, 1997

  7. Evaluating for Muscle Johnson, 1997

  8. Converting LRBF to 10th RBF • IF… < 1.0” THEN… • Leave the same • IF… 1.0 to 1.1” THEN… • add 0.1” • IF… > 1.1” THEN… • add 0.2 to 0.4” • IF… light muscled THEN… • add more • IF… heavy muscled THEN… • add less Johnson, 1997

  9. Estimating LEA using Live Weight • Average Muscled Hogs • 225# = 5.0 in2 • 250# = 5.5 in2 • 275# = 6.0 in2 • Adjust 0.1 in2 for every 5# live weight • Adjust as needed using visual evaluation Johnson, 1997

  10. % Muscle Calculation • Base Percent = 50.0 • Three Factors • Weight • 10th RBF • LEA Johnson, 1997

  11. % Muscle Calculation • Weight Base = 240 # • Adjust +/- 1% for every 5# • Above 240#…decreases % • Below 240#… increases % Johnson, 1997

  12. % Muscle Calculation • LEA Base = 5.0 in2 • Adjust +/- 0.2% for every 0.1 in2 • Above 5.0 in2… increases % • Below 5.0 in2… decreases % Johnson, 1997

  13. % Muscle Calculation • 10th RBF Base = 0.8 in. • Adjust +/- 1% for every 0.1 in. • Above 0.8 in… decreases % • Below 0.8 in… increases % Johnson, 1997

  14. % Muscle Problem: • Live Weight = 260 lbs. • 10th RBF = 0.9 in. • LEA = 5.9 in2 Johnson, 1997

  15. % Muscle Problem: • Live Weight = 260 lbs. Base = 240 Difference = 20 # Adjust down 4% 50.0 - 4 = 46.0% Johnson, 1997

  16. % Muscle Problem: • 10th RBF = 0.9 in. Base = 0.8 in. Difference = 0.1in. Adjust down 1% 46.0 - 1 = 45.0% Johnson, 1997

  17. % Muscle Problem: • LEA = 5.9 in2 Base = 5.0 in2 Difference = 0.9in2 Adjust up 1.8% 45.0 + 1.8 = 46.8% Johnson, 1997

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