STABLE MIX SENIORFor those special friends who have entered their golden years, or hard keepers, Senior Stable Mix is formulated to meet the particular challenges they face. Research has shown that senior and geriatric horses are less able to absorb protein and for this reason our Senior Stable Mix provides a minimum of 12. 5% crude protein. Because older horses also have a reduced capacity for absorbing minerals, Senior Stable Mix utilizes Zinpro's premier organic