What the Heck Is fibre concentrated horse feed?

http://haryanadaily.in//story/393395/with-half-of-britains-horses-overweight-bifid-launches-grainfree-lowsugar-feed-for-the-nations-gooddoers.html

Gentle horse feed for sensitive stomachs, designed to support comfortable digestion, intestinal health and easy nutrient absorption. A low sugar fiber-rich formula with naturally sourced ingredients to help maintain steady digestion and overall health.