Ricci won't eat just beet pulp, that's the problem. She's been getting alfalfa hay, beet pulp, and some grass pellets, because I need a wet "grain" that can more or less hide her supplements. Ricci has decided she doesn't like it, hence the need to change her "grain" situation.
I feed my horses a soybean hull based pellet which also contains rice bran. They love the taste and I can mix in my biotin supplement with a little water and there are no issues. Moorglo is another popular feed with similar ingredients.