Since 1894, Purina has been helping horses live up to their fullest potential. Impact Professional delivers premium nutrition that is optimized for your senior horse to meet the demands of the equine professional. With over 100 years of expertise and research in equine nutrition and a dedicated team of Ph.D. Equine Nutritionists and Equine Veterinarians, nobody knows more about horse nutrition than Purina. Purina IMPACT is formulated to deliver premium nutrition with only high-quality ingredients that have been proven through years of feedings to support overall horse health and performance. | Purina - Impact Professional Senior Horse Feed | Size 50 lbs