Table 6.
Allocation of forages in database to the combination of MollyRum14 digestion parameters that generates the best prediction for methane production (g CH4/d) and methane yield (g CH4/kg DMI)
| FS | |||
|---|---|---|---|
| 0.0 | 0.5 | 1.0 | |
| Methane production (g CH4/d) | |||
| SLOW | – | – | Forage rape (14.3) |
| MOD | – | – | – |
| FAST | Bulb turnip (19.0), perennial ryegrass (8.0), white clover (23.6) | – | – |
| Methane yield (g CH4/kg DMI) | |||
| SLOW | – | – | Forage rape (17.0) |
| MOD | – | – | – |
| FAST | Bulb turnip (19.5), perennial ryegrass (7.4), white clover (22.0) | ||
The digestion parameters considered were substrate degradation rate (SLOW, MOD, or FAST) and fermentation stoichiometry (FS = 0 favors a more acetogenic fermentation, FS = 0.5 intermediate, FS = 1.0 favors a more propionogenic fermentation). Assessment of predictions were based on RPE1 values (%) shown in brackets. Only forages with n > 3 are included.
1RPE: relative prediction error = [Root mean square prediction error (RMSPE)/mean observed] × 100. An RPE value of <10% indicates good predictive ability, between 10% and 20% reasonable predictive ability, and >20% poor predictive ability.