I kinda think if god made all the creatures and plants, saw them to be good and left us to tend to them, He probably wouldn't be too pleased about the factory farming.
Like, we're made in his image and given dominion over his creation, a microcosom of his dominion over everything. If he wanted pigs to live a life without turning around, he could have just... made them that way. Do we really interpret "dominion" as a way to OK total subjugation of the life below us? 'Cus I always thought of that more as... like, a groundskeeper/caretaker's dominion.