Helps weanlings reach their full potential . . . You know your foal's first years are very important. Proper growth and development depend upon strong genetics, a nurturing environment and good nutrition.Luckily, you're not alone. Purina® Equine Junior® horse feed is a "complete feed", which means it is an all-in-one diet with hay built-in. This feed eliminates nutrient variability of hay or pasture and promotes a consistent diet for growing weanlings.