Table 3.
Rumen pH, milk yield and composition of dairy cows fed LC or HC diets
| Item | LC | HC | SEM | p-Value | ||
|---|---|---|---|---|---|---|
| Diet | Day | Diet × Day | ||||
| Mean pH value | 6.02 | 5.90 | 0.03 | < 0.01 | 0.23 | 0.18 |
| Minimum pH value | 5.65 | 5.50 | 0.05 | 0.02 | 0.08 | 0.38 |
| Time < pH 5.6, min/d | 99.00 | 223.00 | 30.25 | 0.01 | 0.06 | 0. 57 |
| Milk yield (kg/d) week1 | 28.7 | 30.9 | 0.47 | 0.08 | 0.23 | 0.76 |
| Milk yield (kg/d) week18 | 28.05 | 26.92 | 0.30 | < 0.01 | 0.05 | 0.41 |
| Milk protein (%) week1 | 3.34 | 3.41 | 0.03 | 0.11 | 0.53 | 0.79 |
| Milk protein (%) week18 | 3.02 | 2.88 | 0.04 | 0.01 | 0.51 | 0.31 |
| Milk fat (%) week1 | 3.48 | 3.34 | 0.02 | 0.21 | 0.61 | 0.58 |
| Milk fat (%) week18 | 3.54 | 2.94 | 0.04 | 0.02 | 0.12 | 0.81 |