Linseed –These contain high concentrations of linolenic acid, omega 3 and omega 6.  Linseed is very good for the health of the digestive tract, ligaments and tendons, the immune system and prevention and treatment of arthritis.  Need to be boiled. Feed approximately ½ to 1 cup daily depending on the size of the horse. Keep in mind that it can make some horse quite loose in their manure. Vary amount if this happens.