What the Heck Is fibre concentrated horse feed?

https://natural-horse-feed327.urbanvellum.com/posts/what-is-the-top-high-fibre-horse-feed

Gentle horse feed for sensitive stomachs, designed to support gut comfort, intestinal health and efficient nutrient uptake. A reduced-starch high-fibre formula with naturally sourced ingredients to help maintain settled digestion and overall health.