Originally Posted by momo3boys
He will be three in January. He is a rocky mountain gelding. I will be working about 30 min a day. He is too young for much more than that. Not all of that will be riding. We have a lot of ground work to do still. I do not know much about hay...I know that it is really good stuff but I don't know what kind. They will be giving him 3-4 flakes, twice a day.
As he develops and gets older he will build muscle. It just takes time. Gaited horses tend to put on muscle slower than big stock horses. My friend's walker gelding was pretty "lanky" until after he turned 5 yrs old.
If he'll be getting some kind of grass hay, then adding some alfalfa pellets (2 qts AM and PM) to a small portion of the high-fat grain (1 qt AM and PM) and his supplement would be good. Alfalfa provides quality protein for muscle building and growth.
If the hay has alfalfa in it, then I would just stick with a small amount of grain (1-1.5 qts am and pm) with your vit/min supplement in it. If he loses weight, ask the barn management to increase his hay. If they won't, then add a fat supplement to his diet like flax meal or rice bran (1-2 cups a day should be enough), and a digestive aid like Fastrack.
I am a grain-free advocate, but I know you can't always control your horse's diet to a "t" when in a boarding situation. The above is what I would do if he were mine.