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Table 2 Seroprevalencea by sow parity and production flowb of Actinobacillus pleuropneumonia (App), Mycoplasma hyopneumoniae (Mhyo) and swine influenza virus (SIV) in finisher pigs, born within one week from a single farrowing batch and followed from birth to slaughter on an Irish farrow-to-finish commercial farm

From: Associations between animal and herd management factors, serological response to three respiratory pathogens and pluck lesions in finisher pigs on a farrow-to-finish farm

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
  1. 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
  2. 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