My Arabian mare is in a paddock with several other horses, and all she gets is bermuda and alfalfa. She actually prefers the bermuda over the alfalfa which is great, and although each horse is fed two large flakes each (generally one alfalfa and one bermuda), I know that they do play musical food piles. So she gets a little bit more bermuda than everyone else, as she does the clean up after the others have lost interest in the bermuda. She's of a really good weight, almost bordering on slightly fat, only because I don't get out there as much as I'd like. I don't feed her any grains or supplements, though she does get a salt block.