Table 2.
Gas production parameters of different fractions of cauliflower and Romanesco and two reference feeds (sugar beet pulp and wheat DDGS) measured using sheep rumen fluid as inoculum.
| Item | Cauliflower | Romanesco | SEM 2 | p | Reference Feeds | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Leaves | Stems | Sprouts | Leaves | Stems | Sprouts | Vegetable | Fraction | Vegetable × Fraction | Sugar Beet Pulp | Wheat DDGS | ||
| A 1 (mL/g dry matter) | 227 a | 252 b | 233 a | 227 a | 242 b | 221 a | 3.89 | 0.018 | <0.001 | 0.320 | 329 | 185 |
| c (%/h) | 5.00 | 5.34 | 5.07 | 4.38 a | 5.59 b | 4.60 a | 0.155 | 0.033 | <0.001 | 0.016 | 5.21 | 4.15 |
| lag (h) | 4.61 b | 3.52 a | 3.04 a | 4.54 b | 2.68 a | 2.71 a | 0.243 | 0.039 | <0.001 | 0.284 | 3.83 | 0.00 |
| AGPR (mL/h) | 6.16 a | 7.70 b | 6.98 b | 5.60 a | 8.06 b | 6.17 a | 0.258 | 0.119 | <0.001 | 0.065 | 9.52 | 2.55 |
| DMED (%) | 38.3 a | 44.8 b | 44.9 b | 35.8 a | 49.3 c | 43.5 b | 0.70 | 0.225 | <0.001 | < 0.001 | 38.0 | 30.1 |
| ME (MJ/kg DM) 3 | 9.03 a | 10.0 ab | 10.5 b | 9.57 a | 10.1 ab | 11.0 b | 0.217 | 0.830 | <0.001 | 0.930 | 9.63 | 9.73 |
a,b,c Within each vegetable, means in the same row with different superscript differ (p < 0.05); 1 A: asymptotic (potential) gas production; c: fractional rate of gas production; lag: time before starting the gas production; AGPR: average gas production rate; DMED: dry matter effective degradability calculated for a rumen digesta passage of 0.042 per h; 2 SEM: standard error of the mean for the interaction vegetable × fraction (n = 12); 3 ME: metabolizable energy was calculated from gas production at 24 h and chemical composition as proposed by Menke and Steingass [34].