03-03-2013, 11:43 AM
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I'd ditch the sweet feed as well and replace it with wither a multi-vit or a ration balancer. That will take care of the nutrition he'll need to develop his muscles without all the extra calories (and sugar/starch, which are not well digested by horses).
You don't say how much forage he's getting, but if he starts dropping weight beyond what's ideal, I'd increase the forage first, and then consider adding in other non-grain alternatives (alfalfa, beet pulp, flax, rice bran, oil, etc.) before going back to a grain product.