TABLE 2.
Comparisons of milk yield and composition between cows with subclinical S. agalactiae mastitis (GBS) and healthy cows (CON).
| Yield and composition | CON | GBS | SEM | p-value |
| Yield Milk yield (kg/day) | 24.42 | 21.78 | 0.679 | 0.16 |
| ECM1 (kg/day) | 27.99 | 23.87 | 1.004 | 0.11 |
| Lactose (kg/day) | 1.23a | 1.03b | 0.044 | 0.02 |
| Fat (kg/day) | 1.00 | 0.83 | 0.042 | 0.11 |
| Protein (kg/day) | 0.87 | 0.75 | 0.035 | 0.18 |
| Composition | ||||
| Lactose (%) | 5.05a | 4.72ab | 0.412 | 0.05 |
| Fat (%) | 4.11 | 3.82 | 0.105 | 0.08 |
| Protein (%) | 3.58 | 3.44 | 0.230 | 0.34 |
| Fat: protein | 1.15 | 1.13 | 0.124 | 0.86 |
| SCC (× 104 cells/ml) | 85.13b | 329.03a | 62.41 | 0.01 |
1ECM (kg/d) = 0.3246 × milk yield (kg/d) + 13.86 × fat yield (kg/d) + 7.04 × protein yield (kg/d) (Orth, 1992). a,bFor each variable, data are different if they do not share a common letter.