You are trying to tell me that growing food for animals to eat, and then eating the animals, somehow takes less arable land than directly growing foods for humans to eat?
That's just not plausible.
That's just not plausible.
So it's worthless with ruminants. So what? Why not just leave it alone/fallow?
Also, how much water does it take to grow those ruminants and also the animals they feed?