I've heard often that there are no good arguments against keeping animals to produce food. (see for example this YouTube video
What about this argument:
We live in a commercial world. If we do not use animals (for food or something else), I doubt that we would have space for (all) farmed animals such as pigs or cows. They would probably only live in some special parks or forest or zoos and not how they are supposed to live. If the meat industry stopped right now, there would be billions of animals wanting to live free but not enough space or resources for them. It's unlikely that people/governments would be willing to pay for them just to live without "uses".