Have you considered that what is more likely is that we ship our good pigs to them (which they use) and they ship us back meat from an inferior breed of pigs they raise in China ?
Why would you bother to do that? Livestock is not particularly fond of sea voyages, you will have dead loss, not to mention you have to bring them food and everything else. If you really want to send the pork to China then send it AS pork: dead and frozen. And then of course there’s the question of why you’d want to send your higher quality, higher priced, product to a poorer country that can’t pay as much.
The more likely scenario is the normal scenario: raise em here, kill em here, sell em here.
Oh gross! And you just know they would do it. :-)