The Mill Racing Horse FeedThe Mill Racing Horse Feed The Mill Racing is a scientifically formulated horse feed designed for active horses. Contains 13% protein, 8% fat, 10% fiber, and 35% NSC. With beet pulp for improved digestion, yeast culture for better digestibility, organic minerals for increased absorption, and selenium yeast for a safer and more bio available source of selenium. Mill Racing is built for the performance race horse to keep them performing at their best.