What you mean he don't eat meat?

Don't get me wrong, I fully support a person's right to eat what they want. However, I do have a question for the vegeterians out there. What is the purpose of a cow, chicken or pig if not to be eaten? If you believe, or even ifyou don't, that everything in the world has a purpose, what is the purpose of a cow if not to be eaten. If we didn't eat cows, would the world be over run with them?