Beet Pulp if you have the time to soak it (some people swear that it doesn't have to be soaked, but I'd rather take the safe road)
And rice bran if you aren't able to soak it.
Rice bran is fed in smaller quantities and has a higher fat content.
Beet Pulp is more of a forage type, and is known for providing "cool calories"
Just a little 'beet' story - I got a tb off the track about 10 years ago and had huge huge issues with his weight after coming off of such a high protein high calorie diet. It took me 12 months to get him back in good shape. When I get my new mare a few weeks ago she had also been getting a racehorse diet with no exercise and was as a consequence all round and fat and hot :roll: her new dinner consisted of lucerne chaffe, millrun (both of these she was already getting) pellets, and the beet. For a few days she seemed to lose a little but then came back up again and is maintaining a nice weight.
To me if there is a feed out there that gets the same results as oats and other such high calorie foods without the heat then im a fan