So I have a 2 year old Egyptian Arabian and he's kinda thin, his ribs don't show much, but he's still too thin. He's on grass all day everyday, we have a supply of hay but its for winter and we don't have enough to start feeding it to him right now as we also have cattle to feed. So I had him on sweet feed about every other day, and I recently bought Rolling Acres Complete Horse as my sister suggested it and it went moldy a few days after I had bought it because its textured like sweet feed, and no one had told me it would go moldy that quick. I've looked through almost all the feed TSC has and its mostly textured or its for performance, and I just want something to help him gain a little weight. Any suggestions on what I could do? My sister helps me out a lot with my horse and she had said that oats isn't a good idea for him just yet. I also have access to plenty of feed mills, I just want an opinion before I even go to look.