Providing ample free choice, quality hay is the best option to provide the most calories and protein for growing horses. We don’t want to encourage horses to grow their bones too quickly, by consuming too much energy. If your hay quality it sufficient for good growth rates, then supplementing vitamins/minerals with our Harmony Complete Supplement Pellet is the way to go. If your hay quality is low, then our Maintenance Pellet is a great choice to provide added energy and protein for your growing horses’ needs.