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

________________________________________________________

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

SBM

TMEn

(kcal/kg)

Control SBM, 86% PS 3123a

Overprocessed SBM, 83% PS 3190a

Overprocessed SBM, 74% PS 3140a

Overprocessed SBM, 53% PS 3171a

Overprocessed SBM, 39% PS 3045b

Overprocessing has little effect on the ME of soybean meal