Earlier quoted context omitted.
Both food, or medical, is a use of a resource that is created by and for humans. The pig wouldn't have been born had their purpose for food, or medical use, not been there. it's not like humans are capturing wild pigs and using them. I would say that wild animals deserves the right to exist and not hunted (unless they're threatening human interests), but the same cannot be said for bred animals.
I don't see any distinction at all. Can you elaborate? (I'm an omnivore that's relatively OK with animal testing, fwiw)
I hold the same distinction to fishing - i do not like wild fish, but farmed fishes (note: farmed, not fishes caught from the wild, then fattened) are ok (esp. in an enclosed, hydroponic system). Unfortunately, most "farmed" fishes refer to caught fish that is fattened...
Anything that humans create, live or dead, is fair game to be used for any purpose deemed desirable by the creator. The right to live doesn't exist for those organisms. But wild animals that exist without any human intervention should have that right to live.