These days their are so many different types of processed grains out there to choose from. There are benefits to using processed grains over unprocessed grains.
Here at MEA we use a processed grain Gumnuts. It is just barely that has undergone an extrusion process. The extrusion process breaks down the grain to make it much more digestible for the horse, resulting in the horse being able to gain a lot more nutrition from the feed.
It is also a great feed for any horse that may not have teeth that are capable of chewing grains down properly. This is the feed that my old boy Toby eats. Being 33 this year he doesn't have many teeth left so he requires feed that doesn't need to be grinded down in order to get the nutrition out of it.