I would personally steer clear of corn. Unless it's organic, it's going to be GMO. Remember, you are what YOU eat, as well as what that animal eats, too. Goats don't necessarily need grain, or a lot of it, but a little bit can be good for pregnant and nursing does. I'd personally go with barley and oats, and I would sprout it, too.
Alvin Mast wrote: As far as what type of grain we always fed about two parts rolled oats and one part cracked corn along with free choice salt and minerals. I would like to make a suggestion of soaking your grain a few hours if its just whole oats and corn as this will help any type of animal get a lot more nutrients out of the grain which in turn you can feed them less.