There is a vast quantity of food for both you and your animals to be harvested from the wild. Hunting and gathering are human's oldest forms of ensuring food, and it seems a shame to forget those skills now.
Hunting as our primary source of food is as old as we are. There is a primal urge in many of us to chase our food, and that act is often healthier for prey and predator than the mass production alternative.
Within any balanced ecosystem, there are tons of things to eat. The trick is finding and using them without upsetting that balance, or your belly. Knowing your ecosystem is paramount to using it as a food source.