| Number of seeding events | Average age related probability of being PI (×10−2) | % simulation runs resulting in outbreak†| OR | 95% CI |
---|---|---|---|---|---|
Beef herds | Â | Â | Â | Â | Â |
Open heifers | 22 473 | 1.37 | 1.32 | Ref | - |
Pregnant heifers | 5205 | 0.63 | 2.32 | 1.76 | 1.74 – 1.77 |
Open cows (dry) | 1184 | 0.16 | 0.16 | 0.13 | 0.12 – 0.13 |
Open cows (calf at foot) | 8269 | 0.28 | 1.73 | 1.23 | 1.22 – 1.24 |
Pregnant cows (dry) | 5131 | 0.09 | 0.82 | 0.68 | 0.67 – 0.79 |
Pregnant cows (calf at foot) | 2176 | 0.15 | 1.19 | 0.94 | 0.92 – 0.95 |
Dairy herds | Â | Â | Â | Â | Â |
Open heifers | 3188 | 0.84 | 2.00 | Ref | - |
Pregnant heifers | 1734 | 0.54 | 1.95 | 0.92 | 0.90 – 0.93 |
Open cows (dry) | 275 | 0.11 | 0.86 | 0.44 | 0.42 – 0.46 |
Open cows (lactating) | 3510 | 0.30 | 1.79 | 0.67 | 0.66 – 0.68 |
Pregnant cows (dry) | 547 | 0.10 | 1.20 | 0.64 | 0.62 – 0.66 |
Pregnant cows (lactating) | 769 | 0.16 | 1.49 | 0.68 | 0.67 – 0.70 |