not only that but the DDG is limited in how much they can feed them before it becomes a problem, I think Ive read its around 15% max of their diet

there's also an import tariff on ethanol which makes the domestic stuff attractive to produce

What's going to happen is more of the same just on a bigger scale, when the energy prices spiked last go round the poorer 3rd world nations found themselves unable to afford it, so demand fell off a bit, now the food prices are gonna get squeezed and some will starve, literally. The US will undoubtedly wipe out any excess food production and send that towards fuel. The US will cease to export food, and become a net importer of that too. Any poor nations depending on cheap grain from the US are gonna be out of luck unless they grow it themselves.