Purina® Ultium® Gastric Care Horse FeedConsistency is Key Horses thrive on consistency, but theres nothing consistent about competition: performance schedules are anything but predictable, new neighbors arrive in adjoining stalls, and arenas and environments are constantly changing. This inconsistency can take a toll affecting health, attitude, and performance. In fact, even common activities including stall confinement, exercise, and transportation are known to cause stress in horses,