You know I don't need an actual source, maybe these are not exact numbers, but by just reasoning, you can understand too, that if we feed an animal 'till he's three years old and than feed a person for a week with that animal, how much food do you think you wasted, knowing those animals eat more than us? Also you said something about farming [i]practisies[/i], don't blame the farmer for what he does, he doesn't have more space, so he can't afford more, as long as you keep paying him to do it this way, he will keep doing it this way.