My yearling POA has a little potbelly on him. Not bad, but enough that it bugs me lol. He gets hay twice a day, so really free feed hay. He's on pasture, but theres nothing left to eat on it. He gets Omolene 200, just 1 quart at night to help his growing. He's UTD on deworming, etc. What could be causing his potbelly, just hay? Like I said its not bad and he is very well muscled and filled out, he gets worked a few times a week. What can I do to get it to go away? Thanks