Table 1.
Parturition and calf survival status predicted by the population-based (PBM) and individual-based (IBM) methods
| Correct predictions | Correct interval | |||||
|---|---|---|---|---|---|---|
| Year | Status | Known Status: Number | PBM | IBM | PBM | IBM |
| 2011 | Calving | Pregnant, calved: 19 | 19 | 18 | 19 | 18 |
| Not pregnant: 5 | 5 | 5 | – | – | ||
| Calf survival | Survived: 8 | 6 | 6 | – | – | |
| Lost1: PLM = 4; IBM = 3 | 3 | 3 | 3 | 3 | ||
| 20122 | Calf presence | Confirmed calved: 6 | 6 | 6 | 6 | 6 |
| No calf: 9 | 6 | 8 | – | – | ||
| Calf survival | Survived: 4 | 4 | 4 | – | – | |
| Lost: 2 | 2 | 2 | 2 | 2 | ||
| 2004 | Calving | Pregnant, calved: 9 | 9 | 9 | 9 | 9 |
| Not pregnant: 1 | 1 | 1 | – | – | ||
| Calf survival | Survived: 5 | 4 | 2 | – | – | |
| Lost: 4 | 2 | 3 | 2 | 2 | ||
1
The total number of calves known to be lost is one less for IBM as we excluded the female misclassified as not calving.
2
For 2012, pregnancy status is unknown therefore a status of no calf could indicate either not pregnant or calved and subsequently lost before the calf was observed.