What the Heck Is fibre pellet horse feed?

https://daily-horse-feed498.zenbloomer.com/posts/top-horse-feed-for-horses-with-poor-teeth

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