Found this on AlpacaNation on one of the forums:
We buy steamed rolled oats at the feed mill, in a 50# bag. When you open the bag, it smells and looks just like Quaker Oats. Because the oats are rolled, they don't have the sharp, pointed ends to stick the alpacas in the mouth, and they are easier to chew. I also read an article (I think David Colby referenced it here once, but I can't remember for sure.) that said steaming grains changes the proteins in the grain and makes them easier to digest. I have never found pieces of rolled oats in the alpacas' manure like I have when we have fed a feed mix that contains either whole or crimped oats. We have an older female who gets them as part of her regular ration because it helps keep her weight up. If she happens to leave any in her bowl, the others fight over them!
Hopefully this helps.