The only case I can think of, and I don't know how significant it is really, is the case of Prince Edward Island, which, because of a provincial health status they acquired, would restrict any live pigs coming into the province without a permit and without a health certificate of some kind. But because Prince Edward Island is a significant surplus producer of pigs, it had really no material effect, I think. There was never any significant movement of market pigs into Prince Edward Island, for example.
On February 19th, 2015. See this statement in context.