It's a complicated argument, because, for example, hogs can be raised in Canada, finished in Canada, and sent to a U.S. slaughterhouse. It's actually Canadian pork; it was just slaughtered in the U.S. But it would come back into Canada, by your definition, as U.S. pork, because it was slaughtered in the U.S. Yet it was conceived, grown, and fattened right here in Canada. It's complicated, and I'm not sure that it would give consumers the transparency they are looking for. It went down there only for slaughtering.
On February 1st, 2012. See this statement in context.