Watch Out: How feeds free from soy for horses Is Taking Over and What to Do About It

https://blogfreely.net/joyceynjah/how-to-feed-hoveler-pur-muskel-7-things-to-get-right-with-the-daily-rate

Endurance horses log serious miles on engine and topline, and Pur.Muskel backs both with 14.1 MJ/kg of digestible energy and 20% raw protein. Add it into a complete ration at 80–100 g per 220 lb of body weight for heavy work.