Investigation of strategies for the introduction and transportation of replacement gilts on southern Ontario sow farms

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

ISSN: 1746-6148