Table 7.
Physical analysis of diets, Exp. 31
| Item | Roller mill configuration2 | SEM | Probability, P | |||
|---|---|---|---|---|---|---|
| 2-High | 3-High | 4-High fine | 4-High coarse | |||
| Exp. 1 | ||||||
| Critical orifice diameter, mm3 | 24 | 24 | 26 | 24 | — | — |
| Angle of repose, degrees | 52.1d | 54.1c | 57.1a | 55.8b | 0.49 | <0.001 |
| Bulk density, g/L | 603.9a | 587.0c | 588.8c | 598.8b | 1.28 | <0.001 |
| Exp. 2 | ||||||
| Critical orifice diameter, mm | 24 | — | 28 | 26 | — | — |
| Angle of repose, degrees | 50.4b | — | 57.0a | 52.1b | 0.65 | <0.001 |
| Bulk density, g/L | 617.8a | — | 605.3c | 609.5b | 0.74 | <0.001 |
| Exp. 3 | ||||||
| Overall, phases 1–5 | ||||||
| Critical orifice diameter, mm | 23.4 | 23.0 | 27.0 | 24.6 | 2.17 | <0.114 |
| Angle of repose, degrees | 50.6c | 52.4b,c | 54.5a | 52.7a,b | 0.64 | <0.001 |
| Bulk density, g/L | 541.6a | 534.4a,b | 528.0b | 535.9a,b | 3.33 | <0.044 |
| Phase 1 | ||||||
| Critical orifice diameter, mm | 20 | 20 | 26 | 24 | — | — |
| Angle of repose, degrees | 48.6b | 49.3b | 50.3a | 50.4a | 0.31 | <0.001 |
| Bulk density, g/L | 565.6a | 561.1b | 557.8c | 565.3a | 1.09 | <0.001 |
| Phase 2 | ||||||
| Critical orifice diameter, mm | 26 | 28 | 30 | 26 | — | — |
| Angle of repose, degrees | 53.1c | 54.6b | 56.3a | 52.8c | 0.47 | <0.001 |
| Bulk density, g/L | 547.5a | 530.2d | 534.9c | 539.7b | 1.04 | <0.001 |
| Phase 3 | ||||||
| Critical orifice diameter, mm | 28 | 28 | 28 | 26 | — | — |
| Angle of repose, degrees | 52.6c | 56.3a | 57.0a | 53.4b | 0.27 | <0.001 |
| Bulk density, g/L | 538.5a | 529.9c | 528.7c | 535.6b | 0.79 | <0.001 |
| Phase 4 | ||||||
| Critical orifice diameter, mm | 22 | 22 | 28 | 26 | — | — |
| Angle of repose, degrees | 46.8c | 49.5b | 53.9a | 53.4a | 0.32 | <0.001 |
| Bulk density, g/L | 538.5a | 525.8b | 514.6d | 518.2c | 0.73 | <0.001 |
| Phase 5 | ||||||
| Critical orifice diameter, mm | 28 | 24 | 30 | 28 | — | — |
| Angle of repose, degrees | 51.8c | 52.0c | 54.8a | 53.3b | 0.25 | <0.001 |
| Bulk density, g/L | 518.2c | 525.0a | 504.3d | 520.7b | 0.77 | <0.001 |
1A composite sample collected directly from all feeders per treatment was used for analysis.
2Corn was ground using two sets of rolls, three sets of rolls, four sets of rolls in a fine-grind configuration, or four sets of rolls in a coarse configuration.
3Critical orifice diameter measured using Flowdex (Hanson Research) and represents smallest diameter disc in which 50 g of material freely flows on three consecutive attempts.
a–dMeans within row without common superscripts differ (P < 0.05).
—Analysis was only performed on the single sample; therefore, SEM and P values were not to be determined.