Table 2.
Final mixed linear regression models of the effect of mastitis-causing pathogens and somatic cell count on milk composition of composite milk samples in Gyr cows1
| |
Lactose, % |
Protein, % |
Fat, % |
Nonfat solids, % |
Total solids, % |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fixed effects | β | SE | P-value | β | SE | P-value | β | SE | P-value | β | SE | P-value | β | SE | P-value |
| Intercept |
4.755 |
0.053 |
|
3.432 |
0.061 |
|
2.477 |
0.348 |
|
9.168 |
0.073 |
|
11.655 |
0.387 |
|
| Seasonality2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Dry |
Ref. |
… |
… |
Ref. |
… |
… |
Ref. |
… |
… |
Ref. |
… |
… |
Ref. |
… |
… |
| Rainy |
−0.243 |
0.028 |
<.0001 |
0.391 |
0.032 |
<.0001 |
0.616 |
0.096 |
<.0001 |
0.141 |
0.038 |
<.0003 |
0.746 |
0.106 |
<.0001 |
| SCC3 | −0.0002 | 0.00001 | <.0001 | 0.00004 | 0.00001 | <.002 | 0.0003 | 0.00004 | <.0001 | −0.0001 | 0.00002 | <.0001 | 0.0001 | 0.00004 | 0.002 |
1 A total of 764 observations were used in this analysis. 2Seasonality (1 = rainy season, October to March; 0 = dry season, April to September), 3SCC: somatic cell count (x 1000 cells/mL), β: estimated coefficients, SE: standard error for the coefficient, Ref.: reference.