If he is a sorry horse you can feed him kryptonite and it wont hurt him. If he's worth his salt you better wait on someone smarter than me :cowboy:
Quote from web:
Out west, cereal grain hays are commonly fed to horses. These include oat and wheat hay (beardless wheat is more common for horses). They are perfectly fine hays, but it might take a little while for your horses to get used to them.