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. 2018 Sep 7;3(1):359–368. doi: 10.1093/tas/txy099

Table 1.

Analyzed nutrient composition and calculated energy content (DM basis) of food waste from preconsumer (SM), postconsumer (university dining hall and household SSOs), and municipal organic waste collection (TS) facilities in Minnesota compared with nutritional composition of corn and dehulled, solvent-extracted soybean meal (NRC, 2012)

SM (n = 22) University dining hall (n = 60) TS (n = 27) SSOs (n = 12) Soybean meal1 Corn2
Item Mean SD Mean SD Mean SD Mean SD SEM Mean SD Mean SD
Moisture 13, % 61.08 17.16 60.85 12.03 69.07 10.44 72.52 10.30 2.42 NA NA NA NA
Moisture 24, % 8.33 12.49 7.02 4.76 9.84 6.22 5.15 0.69 1.46 10.02 2.62 11.69 2.41
Crude protein, % 25.51a 13.50 18.90b 3.15 17.71b 6.86 13.53b 3.73 1.49 53.05 2.30 9.33 0.93
EE, % 31.57a 18.96 13.58b 3.37 11.09b 6.35 10.60b 5.51 2.05 1.69 0.91 3.94 0.78
Ash, % 7.73a 4.59 5.01b 1.27 7.73a 3.60 5.58a,b 2.22 0.55 7.47 0.51 1.47 0.32
Ca, % 0.98a 1.04 0.25b 0.21 1.02a 0.94 0.85a 0.89 0.14 0.37 0.10 0.02 0.01
P, % 0.64 0.60 0.30 0.07 0.46 0.36 0.31 0.16 0.11 0.79 0.09 0.29 0.05
Na, % 0.77a 0.38 0.85a 0.17 0.72a 0.87 0.29b 0.10 0.08 0.09 0.05 0.02 0.00
NDF, % 12.37b 8.05 6.72b 9.14 22.99a 12.53 24.59a 6.80 2.16 9.12 2.90 10.32 1.97
ADF, % 12.92b 8.27 5.29c 6.88 19.76a 10.45 17.44ab 4.87 1.69 5.87 2.43 3.26 0.83
Starch, % 11.57b 13.45 42.11 10.57 16.28b 9.62 12.50b 5.53 2.36 2.10 NA 70.83 4.61
Energy (kcal/kg)
 GE5 5,909a 1,016 5,419a 349 4,829b 486 4,455b 309 140 4,730 192 3,933 86
 DE6 5,016a 1,152 4,418b 425 3,421c 721 4,552b 283 120 4,022 184 3,451 111
 ME7 4,832a 1,274 4,188b 422 3,198c 575 4,114b 44 120 3,660 NA 3,395 NA
 NE8 3,740a 1,188 3,221b 407 2,252c 532 2,983b 40 110 2,319 NA 2,672 NA

NA = not applicable.

a,b,cMeans with different superscripts within a row differ (P < 0.05).

1Soybean meal, dehulled solvent extracted mean and standard deviation values were obtained from NRC (2012).

2Yellow dent corn mean and standard deviation values were obtained from NRC (2012).

3Moisture content after initial drying process at 60 °C for 72 h.

4Moisture content of initially dried samples at 135 °C for 2 h.

5GE (kcal/kg) determined by adiabatic bomb calorimetry.

6Calculated DE (kcal/kg) = 1,161 + (0.749 × GE, kcal/kg) − (4.3 × Ash, g/kg) − (4.1 × NDF, g/kg) (Noblet and Perez 1993).

7Calculated ME (kcal/kg) = 4,194 − (9.2 × Ash, g/kg) + (1.0 × CP, g/kg) + (4.1 × EE, g/kg) − (3.5 × NDF, g/kg) (Noblet and Perez 1993).

8Calculated NE (kcal/kg) = (0.726 × ME, kcal/kg) + (1.33 × EE, g/kg) + (0.39 × Starch, g/kg) − (0.62 × CP, g/kg) − (0.83 × ADF, g/kg) (Noblet et al. 1994).