What the Heck Is fibre heavy performance feed?

https://equine-nutrition161.brightsora.com/posts/feed-for-horses-for-gut-health-which-to-choose-and-the-reason

Gentle horse feed for sensitive stomachs, designed to support gut comfort, hindgut health and efficient nutrient uptake. A reduced-starch high-fibre formula with natural components to help maintain steady digestion and overall wellbeing.