Barley is high energy foodstuff that can definately compliment your feed ration and is cheaper than equivalent alternatives (corn). We use it in our showstring ration and have got along well with it. It helps lay down the fat, especially in the rear flank ~ giving that deep look. As far as filling in the butt, we haven't seen any real effect in that area. If we have one that needs more lower quarter, they are in the cooler sun up to sun down, rinsed twice, blown completely dry both times, roto brushed, and have a rice root brush almost wore out on them everyday. GROW THAT HAIR! This is the best legal and ethical thing (no syringes, air pumps, or heifer implants here) we have found that works and it keeps the kids out of trouble.