Table 2

Active variables used in multiple correspondence analysis for the transportation of replacement animals, on 161 southern Ontario sow farms
Variable Categories Value label Percentage
p. Frequency of replacement deliveries to this site (days between deliveries) 30 or less 5 37.3%
31 to 45 days 4 6.2%
46 to 60 days 3 18%
61 to 90 days 2 10.6%
91 days or more 1 7.5%
Not applicable 9 20.5%
q. Flow restrictions on vehicles used to transport genetic animals No restrictions, the same vehicle may haul PRRSV positive and negative animals 5 14.3%
The same vehicle can haul PRRSV positive and negative animals but a minimum downtime is required before visits to negative sites following last visit to positive site 4 19.9%
The same vehicle never hauls both PRRSV positive and negative animals 3 21.7%
Truck(s) are dedicated to this site and do not haul animals from other sites 2 44.1%
r. Route restrictions on vehicles used to transport genetic animals No special route selection practices 5 70.2%
Transport routes are outlined proactively to avoid roads with swine and swine-related sites along the route 1 29.8%
s. Transit restriction on vehicles used to transport genetic animals Transport vehicles are allowed to stop en route 5 42.2%
Transport vehicles are allowed to stop en route only at designated times and locations 4 8.1%
Transport vehicles are never allowed to stop en route 3 49.7%
t. Use restrictions on vehicles used to transport genetic animals Vehicles used to transport genetic animals to and from other sites within the production system may transport non-genetic animals or animals to market or collection points 5 32.9%
Vehicles used to transport genetic animals to and from other sites within the production system are not used to transport non-genetic animals or animals to market or collection points 1 67.1%
u. Washing frequency of vehicles used to transport genetic animals Never, rarely, or unknown 5 1.9%
At least once per 20 loads 4 2.5%
At least once per 10 loads 3 8.8%
Between every load 2 48.1%
Not applicable 9 38.8%
v. Pre-rinse with water to flush away loose organic material prior to wash of vehicles used to transport genetic animals Unknown 5 8.8%
No, pre-rinse not done 4 3.8%
Yes, fresh water used 3 48.8%
Not applicable 9 38.8%
w. Disinfectant use on vehicles used to transport genetic animals No disinfectant used or unknown 5 25%
Phenol-based compound (BioPhene, Environ, Tek-Trol, Laro, Lysol) or aldehydes (DC&R, Cidex, Formaldegen) used 4 3.1%
Quarternary ammonium (Roccal, Germex, Zephiran, Hi-Lethol, BioSentry) used 3 2.5%
Hypochlorite (Clorox, Halazone, Chloramine-T) or peroxygen (Virkon) used 2 5.6%
Iodine (Wescodyne, Premise, Iofec, Iosdyn, Losan) or quarternary ammonium combinations (Synergize, Aseptol) used 1 25%
Not applicable 9 38.8%
x. Drying time following wash of vehicles used to transport genetic animals No requirements 5 3.8%
Vehicles allowed to dry completely before next load 4 53.8%
Assisted drying technology is used to dry washed vehicles 3 5.6%
Not applicable 9 36.9%

Note: for some variables, there may have been additional response options that were not selected by any of the herds in our sample. These categories are not presented in the table.

Bottoms et al.

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

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