What the Heck Is native pony forage replacer UK?

https://natural-horse-feed327.urbanvellum.com/posts/guidelines-of-feeding-horses-for-pony-club-riders

Gentle horse feed for sensitive stomachs, designed to support comfortable digestion, hind gut health and efficient nutrient uptake. A low-starch fiber-rich formula with natural components to help maintain calm digestion and overall wellbeing.