For most of my horses, I feed COB, and they sustain well, but I'm not liking it so much as I'm realizing how much of the whole grains go unused by the body. Some of my horses rush through eating their grain, and grains that are swallowed whole tend to pass right out in their poop, being wasted. Someone suggest beet pulp. I know it must be soaked before feeding. But the dangers of expansion still worry me. Another friend suggested rice bran because it is utilized better than whole grains and is less complicated or worrisome as beet pulp. Still another suggested mixing the two.
What do you think is better? And how much do you think I should feed? She is 1 1/2 years old, so she is growing, and she is a National Show Horse (arab x saddlebred).