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).