Since oats are showing up in his manure, this may be a sign that his teeth need to be floated to ensure proper mastication of grain before swallowing. Some horses need more frequent teeth floating than others to ensure proper teeth contact while chewing. An extruded feed will also be easier for him to chew and digest. Topdress the ration with corn oil to increase weight gain. Begin by adding a tablespoon of corn oil and over time increase up to a 1/2 cup of corn oil. Also, realize that feeding rice bran is not a balanced feed. It is very high in phosphorus and low in calcium. The oats also are not a balanced feed. Feeding a high-fat feed that is already balanced may be helpful. Provide free choice hay if the gelding is in a stall or pasture with limited forage. As a horse ages, it can be more difficult to maintain proper weight. Keep a close eye on his body condition and adjust intake accordingly.

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