In the past, semen was required to be EAV (the virus is "equine arteritis virus", while the disease is "EVA") free, with the stallion and semen being tested prior to importation. When the USA and Canada opened the border for the passage of equine semen between the two countries with no restriction, the requirement for "negative EVA" became somewhat of a redundancy, as the USA had no requirement that equine semen being imported from any country be EAV-negative. Added to that, EVA was present in the USA.
Upon review of the CFIA regulations currently in place (which you can do by going to the "Automated Import Reference System at http://airs-sari.inspection.gc.ca/Airs_External/Default.aspx), it now appears that there is no restriction in place for importation of EAV-free or positive semen. It should be noted that I checked only importation requirements for semen imported from the UK and Germany (Germany has EVA endemically present, the UK does not), but neither country's regulations make any mention of EVA.
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