Table 2.
Comparisons of reproductive performance between 2013 (before PED outbreak) and 2014 (after PED outbreak) in January, February, and March
| All | January | February | March | |||||
|---|---|---|---|---|---|---|---|---|
| N | Mean ± SEM | N | Mean ± SEM | N | Mean ± SEM | N | Mean ± SEM | |
| Preweaning mortality, % | ||||||||
| 2013 (before PED outbreak) | 229 | 5.7 ± 1.0b | 54 | 2.6 ± 1.0b | 106 | 6.5 ± 1.6 | 69 | 6.8 ± 1.9 |
| 2014 (after PED outbreak) | 265 | 19.0 ± 2.4a | 97 | 37.6 ± 4.9a | 63 | 6.0 ± 1.9 | 105 | 9.7 ± 3.3 |
| Number of pigs weaned, pig | ||||||||
| 2013 (before PED outbreak) | 243 | 7.7 ± 0.1a | 58 | 7.3 ± 0.2a | 112 | 7.8 ± 0.2a | 73 | 8.0 ± 0.3 |
| 2014 (after PED outbreak) | 278 | 6.3 ± 0.2b | 107 | 4.4 ± 0.3b | 65 | 7.1 ± 0.4b | 106 | 7.6 ± 0.2 |
| Weaning-to-first mating interval, day | ||||||||
| 2013 (before PED outbreak) | 221 | 4.5 ± 0.4 | 51 | 4.0 ± 0.1b | 112 | 4.0 ± 0.1 | 58 | 6.0 ± 1.6 |
| 2014 (after PED outbreak) | 223 | 5.2 ± 0.6 | 106 | 6.4 ± 1.2a | 59 | 4.1 ± 0.1 | 58 | 4.0 ± 0.1 |
| Farrowing rate, % | ||||||||
| 2013 (before PED outbreak) | 302 | 79.8 ± 2.3a | 85 | 78.8 ± 4.5a | 74 | 78.4 ± 4.8a | 143 | 81.1 ± 3.3a |
| 2014 (after PED outbreak) | 356 | 63.8 ± 2.6b | 96 | 57.3 ± 5.1b | 161 | 64.0 ± 3.8b | 99 | 69.7 ± 4.6b |
Means within year and month without a common letter (a–b) are significantly different (P < 0.05)