Table 4.
Estimates with corresponding confidence intervals (95% CI) and P-values for the milk production parameters milk yield (kg/cow/day), protein content (%) and fat content (%) from the multivariable linear mixed model
| Production trait | Milk yield | Protein content | Fat content | ||||
|---|---|---|---|---|---|---|---|
| Estimate (95% CI) | P-value | Estimate (95% CI) | P-value | Estimate (95% CI) | P-value | ||
| Intercept | 16.69 (13.46; 19.93) | < 0.0001 | 4.06 (3.87; 4.24) | < 0.0001 | 4.87 (4.49; 5.25) | < 0.0001 | |
| FLC | FLC negative | 1.62 (0.07; 3.18) | 0.0406 | -0.05 (-0.15; 0.05) | 0.3666 | -0.05 (-0.25; 0.15) | 0.6092 |
| FLC positive | Baseline | Baseline | Baseline | ||||
| Parity | 1 | -3.49 (-4.38; -2.59) | < 0.0001 | -0.00 (-0.06; 0.05) | 0.9508 | -0.02 (-0.13; 0.10) | 0.7946 |
| 2 | -1.64 (-2.55; -0.72) | 0.0005 | 0.09 (0.04; 0.15) | 0.0017 | 0.03 (-0.09; 0.14) | 0.6284 | |
| 3 | 0.80 (-0.15; 1.76) | 0.1000 | 0.07 (0.01; 0.13) | 0.0290 | -0.06 (-0.18; 0.06) | 0.2918 | |
| 4 | 0.71 (-0.33; 1.75) | 0.1790 | 0.09 (0.02; 0.15) | 0.0075 | 0.06 (-0.07; 0.19) | 0.3784 | |
| > 4 | Baseline | Baseline | Baseline | ||||
| Lactation stage | DIM ≤ 14 | 10.20 (8.68; 11.71) | < 0.0001 | -0.28 (-0.37; -0.18) | < 0.0001 | -0.30 (-0.49; -0.10) | 0.0026 |
| DIM 14-77 | 11.11 (10.39; 11.84) | < 0.0001 | -0.62 (-0.67; -0.58) | < 0.0001 | -0.63 (-0.72; -0.54) | < 0.0001 | |
| DIM 78-140 | 8.35 (7.61; 9.08) | < 0.0001 | -0.51 (-0.56; -0.47) | < 0.0001 | -0.58 (-0.68; -0.49) | < 0.0001 | |
| DIM 141-231 | 4.65 (4.03; 5.27) | < 0.0001 | -0.25 (-0.29; -0.21) | < 0.0001 | -0.31 (-0.39; -0.23) | < 0.0001 | |
| DIM ≥ 232 | Baseline | Baseline | Baseline | ||||
| Genetic line | DSN | -1.02 (-2.73; 0.69) | 0.2406 | -0.05 (-0.16; 0.05) | 0.3008 | -0.28 (-0.49; -0.08) | 0.0067 |
| Crosses | 0.33 (-1.93; 2.58) | 0.7744 | 0.02 (-0.12; 0.16) | 0.7717 | -0.10 (-0.38; 0.19) | 0.5039 | |
| HF-GHm | 1.45 (0.21; 2.68) | 0.0223 | -0.20 (-0.27; -0.12) | < 0.0001 | -0.40 (-0.56; -0.25) | < 0.0001 | |
| HF-GHp | 0.94 (-0.64; 2.52) | 0.2434 | -0.15 (-0.24; -0.05) | 0.0044 | -0.33 (-0.52; -0.13) | 0.0012 | |
| HF-NZ | Baseline | Baseline | Baseline | ||||
| Test-day season | < September | 1.39 (0.79; 1.98) | -0.23 (-0.27; -0.19) | < 0.0001 | -0.26 (-0.34; -0.19) | < 0.0001 | |
| ≥ September | Baseline | < 0.0001 | Baseline | Baseline | |||
| Time span | ≤ 8 | -1.61 (-3.55; 0.31) | 0.0998 | -0.12 (-0.23; -0.01) | 0.0581 | -0.05 (-0.28; 0.18) | 0.6782 |
| > 8 and ≤ 16 | -3.71 (-5.54; -1.88) | < 0.0001 | -0.09 (-0.20; 0.01) | 0.1228 | 0.11 (-0.11; 0.33) | 0.3169 | |
| > 16 and ≤ 24 | -2.72 (-4.47; -0.96) | 0.0024 | -0.04 (-0.14; 0.07) | 0.5639 | 0.18 (-0.03; 0.39) | 0.1014 | |
| > 24 and ≤ 32 | -2.49 (-4.67; -0.51) | 0.0136 | -0.05 (-0.17; 0.07) | 0.5143 | 0.19 (-0.05; 0.43) | 0.1180 | |
| > 32 | Baseline | Baseline | Baseline | ||||
| Random effects | Estimate | Estimate | Estimate | ||||
| Farm | 7.97 | 0.01 | 0.06 | ||||
| Cow | 9.94 | 0.03 | 0.15 | ||||
| Residual | 13.41 | 0.06 | 0.22 | ||||
Abbreviations: CI confidence interval, FLC binary defined faecal larvae count (FLC = 0 classified as ‘FLC negative’; FLC ≥ 1 classified as ‘FLC positive’) as a parameter for D. viviparus infection status