Oh, you're still feeding Ugard....
Well, consider his former lifestyle. Hay only at night, and maybe grain while he was working, right? To really know what his stomach looks like inside you need him scoped.
My last OTTB never saw Ugard or the like. He came underweight, cribbed and his poop smelled bad....really bad. I just fed him as if he had ulcers, most likely hindgut ulcers, too. Low starch feed, free choice hay, some alfalfa. He gained weight, grew a couple of inches and the smell went away, within 3 months....and he stopped cribbing.
I believe, that's the key to a healthy tummy.