If you apply a CCIA tag to an animal that is already tagged, the CCIA requires notification of the cross-referenced numbers.
CCIA tags should never be re-used.
Records of the ID number of re-tagged animals (ie. animals who have lost tags) should be kept along with any known information of where they came from.
CCIA tags should not be removed from an animal that is already tagged unless the number has been retired from the CCIA database as in the case of dead or exported animals.
The Canadian Food Inspection Agency (CFIA) has announced a regulatory amendment that requires all cattle to be tagged prior to leaving their farm of origin, including those going to community pasture, exhibition site, test station or veterinary clinic (unless going to an approved tagging site).