Certainly, you're correct, there is a little muddying of the lines, there, but I think provincial and federal rules can complement each other. It would depend on the situation, but there is real potential danger of bringing in infection of some kind, even just by being on the property, without even necessarily getting right onto the barn.
Dr. Stark is better to speak to this than I am, but there are organisms that can live in the soil, which the animals may have access to once they're outside. Certainly we're trying to encompass all of the areas in which animals may be housed, whether it's outdoors or indoors.