What is a feed that is high in grain content for cattle?

On the surface it seems that these two different animals eat the same things. And in a way they do. But cattle need a higher level of protein, especially to make milk for dairy farming. If you feed alfalfa cattle get the first and second cutting of hay. Horses do much better on second and subsequent cuttings. If you feed your horse any grain or all-in-one, make sure it's not too rich for him.