Horses should eat a high quality forage or hay with around 12% protein. No grain is needed for most horses unless they work very hard or if you cannot get good hay. The ideal grain for horses is oats. Why do you think they call them oats burners.
CCA, CPSS, CPSEC
Reared on a farm in Southwestern Illinois
Educated at the University of Illinois in Urbana-Champaign (1977)
25 years with USDA-SCS (NRCS since 1994)
Soil-Right Consulting Services, Inc. 2005 - 2015
RPM Soils LLC 2016 to present