Table 2.
Summary of results: multivariable fractional logistic regression models with overall culling (OC) or primiparous–primiparous culling proportion (PPC) as dependent variable against scaled herd performance indicators in four areas.
| OC | PPC | |||
|---|---|---|---|---|
| Indicator a | OR (95% CI)b, c | p- value | OR (95% CI)b, c | p- value |
| Intercept | 0.39 (0.38–0.39) | < 0.001 | 0.23 (0.22–0.23) | < 0.001 |
| Reproduction b | ||||
| Services per conception (nulliparous) | 1.01 (0.99–1.02) | 0.81 | 0.99 (0.98–1.01) | 0.69 |
| Services per conception (multiparous) | 1.01 (0.99–1.02) | 0.20 | 0.99 (0.97–1.01) | 0.28 |
| Average DIM at first service | 1.00 (0.99–1.00) | 0.60 | 1.03 (1.01–1.04) | < 0.001 |
| Calv_int | 1.02 (1.01–1.02) | < 0.001 | 1.12 (1.10–1.14) | < 0.001 |
| AFC | 1.01 (1.00–1.02) | < 0.001 | 1.01 (0.99–1.02) | 0.08 |
| Longevity b | ||||
| Age_tot | 0.96 (0.95–0.96) | < 0.001 | 1.11 (1.10–1.13) | < 0.001 |
| Age_culled | 0.92 (0.92–0.93) | < 0.001 | 0.63 (0.62–0.64) | < 0.001 |
| Life_prodn | 0.92 (0.91–0.93) | < 0.001 | 0.95 (0.93–0.97) | < 0.001 |
| Production b | ||||
| avg_FPCM | 1.08 (1.07–1.08) | < 0.001 | 0.99 (0.97–1.01) | 0.50 |
| Udder health b | ||||
| avg_high_SCC | 1.01 (1.00–1.01) | < 0.001 | 0.97 (0.96–0.98) | < 0.001 |
All indicators were scaled (centered to mean) due to differences in scale.
OR, odds ratios; services per conception, number of inseminations/services per calving; average DIM at first service, interval in days in milk (DIM) between last calving and first insemination; AFC, age at first calving; Age_tot, total herd average age; Age_culled, herd average age of culled cows; Life_prodn, lifetime production of milk; Avg_FPCM, average fat-protein corrected milk; Avg_high_SCC, average percentage of high SCC cows in the herd.
All values rounded to two digits after the decimal.