| Extruded corn meal, % of DM |
| P value | ||||
Item | 0 | 10 | 20 | 30 | SEM | Linear | Quadratic |
Rumen pH | 5.69 | 5.72 | 5.65 | 5.65 | 0.16 | 0.78 | 0.92 |
Total VFA, mM | 107 | 107 | 107 | 116 | 6.57 | 0.36 | 0.46 |
Rumen VFA, mol/100 mol | |||||||
Acetate | 52.5 | 54.8 | 54.9 | 49.2 | 3.54 | 0.55 | 0.28 |
Propionate | 33.5 | 30.4 | 28.6 | 33.6 | 3.44 | 0.92 | 0.26 |
Isobutyrate | 0.43 | 0.53 | 0.54 | 0.56 | 0.10 | 0.43 | 0.70 |
Butyrate | 10.7 | 11.0 | 12.5 | 12.2 | 1.33 | 0.33 | 0.83 |
Isovalerate | 1.77 | 2.28 | 1.86 | 2.81 | 0.46 | 0.22 | 0.64 |
Valerate | 1.14 | 1.03 | 1.61 | 1.66 | 0.14 | <0.01 | 0.57 |
Acetate: propionate | 1.68 | 2.25 | 2.00 | 1.48 | 0.44 | 0.67 | 0.24 |
Methane2 | 0.43 | 0.47 | 0.49 | 0.42 | 0.05 | 0.90 | 0.26 |