Because he more than likely has ulcers, haha. With grain based feeds, while they may be high in fat, they irritate his stomach and cause him to crib. In the long run it is also cheaper. I could pay 12 dollars for a 50 pound bag of traditional hard feed, and feed 4-6 pounds a day, and pay 50 dollars for one month of feed....this would not include his hay pellets for his added forage, which in themselves are 50 dollars for one month. Or I can pay 50 dollars for two bags of ration balancer that will last me a little over 2 months, feed him at max 2 pounds in a day, and he gets the same vitamins and minerals as the other feed, with much less bulk and no irritation (the first ingredient is rice bran, if I remember correctly? but don't quote me).
Is there any thing I can add to his rations that is strictly fat and nothing else? lol that would be amazing if something like that actually existed.