What the Heck Is fibre heavy performance feed?

https://horse-feed-suppliers749.nexorafield.com/posts/what-horse-feed-is-best-for-horses-prone-to-colic-2

Gentle horse feed for sensitive stomachs, designed to support digestive comfort, intestinal health and efficient nutrient uptake. A low sugar high-fibre formula with natural ingredients to help maintain calm digestion and overall wellbeing.