Table 3.
Effect of humic substance on gasses production in a Rusitec fed a mixed hay – concentrate diet.
| Concentration HS (g/d) |
P-value |
||||||
|---|---|---|---|---|---|---|---|
| Control | 1.5 | 3.0 | SEM | Treatment | Linear | Quadratic | |
| Total gas (mL/d) | 800.0 | 840.0 | 900.0 | 53.01 | 0.43 | 0.21 | 0.83 |
| CO2 (mL/d) | 66.7 | 69.7 | 79.1 | 7.76 | 0.51 | 0.28 | 0.74 |
| CO2 (mg/d) | 131.0 | 136.9 | 155.5 | 15.26 | 0.51 | 0.28 | 0.74 |
| CO2 (mg/g DM disappeared) | 21.5 | 24.1 | 26.8 | 4.59 | 0.73 | 0.44 | 0.99 |
| CH4 (mL/d) | 23.6 | 22.8 | 26.1 | 2.97 | 0.72 | 0.57 | 0.58 |
| CH4 (mg/d) | 16.9 | 16.3 | 18.6 | 2.15 | 0.72 | 0.57 | 0.58 |
| CH4 (mg/g DM disappeared) | 2.89 | 2.90 | 3.26 | 0.623 | 0.89 | 0.68 | 0.82 |
HS, humic substances.