I've never had any problems with any of my horses getting silly on beet pulp (Arabs and Paints). In fact, what I like about beet pulp is that it is what you might call a bridge feed, right smack in between hay and grain. I think that's why people like to use it to put weight on their horses, you can feed more of it than you can grain, getting plenty of roughage and not too much protein. Actually, my guys are more likely to get silly on senior feed, I suspect, because of the molasses.
I don't have any one in hard training at the moment, so haven't tried Ultium, though I am considering getting it for my endurance mare as I start her back into conditioning now that her son is weaned. That's why I've been interested in people's opinion of Ultium.
