Can you exist for your own purpose if you have no authority over your own existence? Farm animals exist because of their owners, therefore they exist for their owner's purposes alone, no?
How do you feel now?
The Zondors must really like the taste of human meat if they think it's worth it.
It also wouldn't work because if you have enough humans in one place under harsh conditions, rest assured a rebellion is in order.
Cows should still be treated humanely and only have one bad day (when they're slaughtered) since they're clearly capable of suffering, but ignoring the difference is a little dishonest, intellectually.
I can understand an argument to the affirmative, but it is completely contrary to my way of thinking.
To quote Hamlet : "I could be bounded in a nutshell, and count myself king of infinite space"
or Hawking : "In my mind, I am free."
It’s definitely not an ironclad argument: children also exist only because of their parents, but (our modern) society does not grant parents the right of life or death over their children at will.
Rousseau : "Man is born free, and everywhere he is in chains."
To find acceptable the exploitation of animals while finding immoral the exploitation of humans, you must believe that animals differ from humans in some fundamental ways!
Comfortable, caring bondage is still bondage, and we should not forget that.