From: Herd-level risk factors for cow and calf on-farm mortality in Estonian dairy herds
Variable | Median (Q1; Q3) | n | p-valuea |
---|---|---|---|
Herd size (number of cows) | 129.7 (53.7; 459.7) | 212 | < 0.001 |
Herd average milk yield per cow per year (kg) | 8787 (6950; 9758) | 212 | 0.002 |
Herd average milk fat/protein ratio | 1.2 (1.2; 1.3) | 212 | 0.001 |
Herd average age at first calving (days) | 813.0 (764.3; 888.7) | 212 | 0.024 |
Herd average interval from calving to insemination (days) | 92.3 (79.6; 111.7) | 204 | 0.061 |
Herd average number of inseminations per conception | 1.9 (1.7; 2.2) | 204 | 0.004 |
Herd average first insemination conception rate (%) | 53.9 (47.2; 60.6) | 204 | 0.003 |
Herd proportion of stillbirths (%) | 7.5 (5.6; 9.5) | 212 | 0.008 |
Herd proportion of abortions (%) | 0.8 (0; 1.6) | 212 | 0.022 |
Herd average number of lactations | 2.4 (2.2; 2.7) | 212 | < 0.001 |
Herd average age at first insemination (days) | 498.7 (457.3; 585.7) | 187 | 0.123 |