What the Heck Is low starch competition feed?

https://performance-horse-feed088.wpsuo.com/how-to-select-horse-feed-for-maintaining-body-condition

Gentle horse feed for sensitive stomachs, designed to support gut comfort, hindgut health and better nutrient absorption. A low-starch fibre-rich formula with naturally sourced ingredients to help maintain steady digestion and overall wellbeing.