|
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
