Predictor variables | App | Mhyo | SIV |
---|
Sow parity |
1 | 97.4 | 100 | 81.6 |
2 | 91.9 | 100 | 81.8 |
3 | 92.5 | 100 | 83.0 |
4 | 90.7 | 100 | 80.0 |
5+ | 76.6 | 100 | 70.2 |
Production flow |
1 | 86.1 | 100 | 86.1 |
2 | 91.8 | 100 | 71.5 |
3 | 93.2 | 100 | 71.2 |
- aSerum samples were analysed using enzyme-linked immunosorbent assay (ELISA) according to the manufacturer’s instructions (IDEXX, Hoofddorp, The Netherlands) for the three respiratory pathogens. Sample-to-positive ratio values were calculated for App and Mhyo while sample-to-negative ratio values were calculated for SIV. Samples with sample-to-positive values ≥0.40 for Mhyo, ≥ 0.50 for APP and samples with sample-to-negative values SIV ≤0.60 were considered as positive as per the criteria given in the manufacturer’s instructions
- bAll pigs were slaughtered at 24 weeks and were retrospectively classified into three production flows according to the time required to move to the next production stage (Flow 1 = normal; Flow 2 = delayed by 1 week; Flow 3 = delayed by more than 1 week). Pigs were selected from each flow in a nested case control study matched by sow parity, birth body weight and number of piglets born alive