Purina recently announced updates to the Equine Senior and Equine Senior Active horse formulas. Equine Senior now contains ActivAge™ prebiotic.  New ActivAge™ prebiotic has been scientifically proven to promote optimal immune function in senior horses. ActivAge™ prebiotic is a proprietary feed additive that contains beneficial metabolites, including vitamins, minerals, amino acids and antioxidants. These metabolites work together to support [...] ...