Table 2.
Effect of pasture type and season on in vitro gas production kinetics.
| Pasture Type | Season | p-Value | ||||||
|---|---|---|---|---|---|---|---|---|
| Variable | HS | LS | Autumn | Spring | SEM | P | S | P × S |
| TGP24 | 218 | 204 | 204 | 218 | 3.2 | * | * | n.s. |
| PF | 4.30 | 4.58 | 4.62 | 4.27 | 0.089 | n.s. | * | n.s. |
| Predicted Michaelis–Menten parameters | ||||||||
| A | 249 | 232 | 234 | 247 | 4.0 | * | n.s. | n.s. |
| C | 0.12 | 0.11 | 0.11 | 0.12 | 0.003 | n.s. | n.s. | n.s. |
| MDR | 0.12 | 0.12 | 0.12 | 0.13 | 0.003 | n.s. | n.s. | n.s. |
| K | 6.48 | 6.52 | 6.61 | 6.39 | 0.147 | n.s. | n.s. | n.s. |
| n | 149 | 148 | 148 | 149 | 0.02 | n.s. | n.s. | n.s. |
| ta | 3.11 | 3.1 | 3.15 | 3.06 | 0.079 | n.s. | n.s. | n.s. |
| tb | 13.6 | 13.7 | 13.9 | 13.4 | 0.35 | n.s. | n.s. | n.s. |
| tc | 28.4 | 28.9 | 29.3 | 28.0 | 0.93 | n.s. | n.s. | n.s. |
HS: high sugar pasture; LS: standard cultivar pasture; SEM: standard error of the mean; P: pasture type; S: season; P × S: interaction between pasture type and season; TGP: 24-h gas production (mL/g OM); PF: partitioning factor (digested OM per TGP); A: asymptotic gas production (mL/g OM); C: degradation rate at half-life (%/h); MDR: maximal degradation rate (%/h); n: shape of the curve; K; ta; tb; tc: time to produce 50, 25, 75 and 90% of gas production, respectively; p *: p ≤ 0.05; n.s.: not significant.