Meat is fine to grind em up.
I had a bull that OD'd on grain as a yearling, he grew out fine. Took a week to save him at the time, and he didn't look like he was gonna make it, but pulled through.
But after a couple of years his feet went on him, and he was always rectally bleeding - it didn't seem to bother him, he was just always losing a bit of blood. He then started to go downhill when his feet were bothering him, and before he could lose much condition he went packin. That was a more extreme case. On the other end of things is long toes. They just will always need their hooves trimmed.
All kinds of info:
http://www.merckmanuals.com/vet/dig..._forestomach/grain_overload_in_ruminants.html