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Table 1 Univariable associations (P values) between predictor variables and sample-ratio-values at slaughter for 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 Value App Mhyo SIV
Early life predictor variables
 Sow parity, mean ± SD 3.4 ± 1.33 0.015 0.325 0.718
 Number of piglets born alive, mean ± SD 13.2 ± 2.34 0.282 0.393 0.745
 Birth weight, kg, mean ± SD 1.2 ± 0.27 0.538 0.976 0.871
 Litter size, mean ± SD 14.6 ± 1.99 0.551 0.270 0.919
 Weaning body weight, kg, mean ± SD 6.5 ± 1.55 0.797 0.125 0.341
 Cross-fostering, % 32.7 0.138 0.806 0.586
Production flow, n 223 < 0.001 0.271 0.002
Pluck lesions
 Pericarditisa, % 16.1 0.441 0.373 0.583
 Heart condemnationsa, % 11.6 0.600 0.119 0.190
 Pleurisyb, % 25.6 0.489 0.580 0.797
 Enzootic pneumonia-like lesionsc, % 42.1 0.179 0.006 0.740
  1. aScored at slaughter as present or absent
  2. bScored using the Slaugherhouse Pleuritis Evaluation System developed by Dottori et al. [29], from 0 = absence of lesions to 4 = severely extended bilateral lesions and re-classified as present or absent
  3. cEnzootic pneumonia-like lesions were ranked according to the BPEX Pig Health Scheme [28] and re-classified as present or absent