When corn goes through drought, it's reproductive system starts shutting down, in turn not utilizing all the nitrogen available, then you get high nitrate corn that can be toxic to cattle. It will make mother cows abort calves, and can really wreck their digestive system, ultimately ending in death. A lot of corn will not be able to be chopped for this very reason.
CRP hay isn't going to be much for protien, but its better than snow balls and sticks this winter. It is an emergency situation right now for cattle growers. Hay supply is slim to none, everyone is hanging onto what little they got this year. Pastures are burned up, and a lot of people have been already feeding hay. It's a tough year for sure.
It doesn't bother me a bit that they are having to cut CRP to help make ends meet for feed in livestock. They can not cut 100% of it anyways, unless they buy their full contract back. If they cut 50%, then they only have to buy back 10% of their contract.