Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Christina,
Why not forget about the rice bran and just give your TB more hay? Your horse is underweight because he is not getting enough to eat. It's as simple as that.
He needs to have both grass hay plus alfalfa hay all the time -- 24/7 -- all day and all night. If not, his stomach will sit empty of forage but not of acid -- acid is secreted even on an empty stomach. This leads to an ulcer which leads to weight loss. I like a 60/40 grass/alfala combination for TBs.
Feed him.
And give him a good supplement to add back the vitamins that are not in hay. Go with Glanzen Complete as my first choice -- 3 full scoops per day. Or go with High Point plus Nutra Flax.
Rice bran is very, very high in phosphorus and must be fed along with alfalfa to balance out with extra calcium. If you want to add it to his diet, give him 1/2 pound per day, divided between meals. You may want to consider getting a scale, if you don't already have one.
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
Where are you from? Waverly, Ohio