Infinite amount of corn and space. What animal to raise?

Hello,

I am attempting to raise as much of my family's diet on food we raise ourself on our family farm. We grow corn and if we wanted to we could store an infinite amount of ground corn that falls out of our machinery every year.

We already have chickens for eggs and meat. Space is not an issue.

What animal should we get that can be fed with corn and grass to supplement our chicken flock? I'm willing to entertain all warm blooded options.