What the Heck Is starch reduced horse feed?

https://equine-nutrition986.lowescouponn.com/horse-feed-for-foals-and-weanlings-how-to-feed-and-when

Gentle horse feed for sensitive stomachs, designed to support gut comfort, hindgut health and easy nutrient absorption. A low sugar high-fibre formula with natural components to help maintain steady digestion and overall health.