Table 4

Discrimination measures of variables that were used in multiple correspondence analysis of the introduction and transportation of replacement animals, on 161 southern Ontario sow farms, the variables with the 5 highest discrimination measures are presented
Solution Variable Discrimination measure
Dimension 1 Dimension 2
Introduction variables PRRS virus status of breeding female replacements in isolation/acclimation 0.749 0.173
Isolation/acclimation period (days) 0.724 0.452
Location of replacement animal isolation housing relative to this site 0.673 0.266
Replacement animal isolation flow 0.664 0.185
Serum testing of replacement animals for PRRS virus or antibodies by PCR or ELISA upon exit from acclimation/isolation site(s) 0.643 0.103
Time (days) between last exposure to injected serum and entry of replacements into breeding herd 0.127 0.569
Replacements are exposed to serum from viremic pigs or sows via injection prior to entry 0.116 0.527
Location of replacement animal acclimation housing relative to this site 0.338 0.258
Transportation variables Pre-rinse with water to flush away loose organic material prior to wash of vehicles used to transport genetic animals 0.957 0.346
Washing frequency of vehicles used to transport genetic animals 0.956 0.285
Disinfectant use on vehicles used to transport genetic animals 0.956 0.558
Drying time following wash of vehicles used to transport genetic animals 0.921 0.171
Flow restrictions on vehicles used to transport genetic animals 0.809 0.330
Transit restriction on vehicles used to transport genetic animals 0.253 0.426
Route restrictions on vehicles used to transport genetic animals 0.043 0.287

Bottoms et al.

Bottoms et al. BMC Veterinary Research 2012 8:217   doi:10.1186/1746-6148-8-217

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