metabolizable energy soybean meal
TRANSCRIPT
Metabolizable Energy of Soybean Meal
Nick Dale and Amy Batal
University of Georgia
Department of Poultry Science
Solvent-extracted dehulled soybean meal
Solvent-extracted soybean meal with hulls
Soybean meal contaminated with foreign material
Classical ME StudiesApparent metabolizable energy of soybean meals
(SBM) from 1960 to 1962
SBM
Laboratory 44% Protein 50% Protein Difference kcal/kg, 88% DM
Cornell 2,195 2,474 11.8
Connecticut 2,200 2,356 6.9
Guelph 2,352 2,542 8.8
Average 2,249 2,457 9.2
True metabolizable energy with nitrogen correction (TMEn) of dehulled soybean meal from 1987 to 1988
TMEn
____________________
Laboratory Samples High Low Mean
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no. -----kcal/kg, 88% DM---
Agriculture Canada 29 2,692 2,187 2,421
Georgia 10 2,541 2,339 2,438
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Design of present study
• 23 samples of Soybean meal
• Proximate composition
• TMEn with 10 SCWL Roosters
Correlation between Crude Fat and TMEn of soybean meal
r2 = 0.07
2000
2200
2400
2600
2800
3000
3200
0.6 0.7 0.7 0.9 1.1 1.2 1.5 1.5 1.6 1.8 2.0 2.8
Crude Fat (%)
TM
E
Variation in crude fat between samples is too low to be useful in prediction equation.
Correlation between Crude Fiber and TME in soybean meal
r2 = 0.61
2000
2200
2400
2600
2800
3000
3200
1.3 3.7 3.9 3.9 4.0 4.5 5.4 6.1 6.6 6.7 7.2 8.3
Crude Fiber (%)
TM
E
Metabolizable energy is negatively correlated with crude fiber.
Prediction Equation:Calculating ME of soybean meal from
crude fiber
TMEn = 3157 – 75 (crude fiber)
(Dry matter basis), r2 = 0.61
Example: 88% Dry matter
TMEn = 2778 – 66 (crude fiber)
TMEn = 2778 – 66 (4.8)
TMEn = 2461 kcal/kg (1119 kcal/lb)
Overprocessed soybean meal
Effect of overprocessing on the metabolizable energy of SBM
3045bOverprocessed SBM, 39% PS
3171aOverprocessed SBM, 53% PS
3140aOverprocessed SBM, 74% PS
3190aOverprocessed SBM, 83% PS
3123aControl SBM, 86% PS
TMEn
(kcal/kg)SBM
Overprocessing has little effect on the ME of soybean meal