I am doing that this morning. However, when I asked this question, it was the weekend and they weren't open. I wanted to get started over the weekend, that's why I posted the question.
Sorry, I didn't mean to sound harsh - I know you were just trying to help
I did get a call back from Moormans today and he suggested 1/2 oz per day, so I'll just give him about 1 tsp morning and 1 tsp evening along with his hay. That should take care of it!
I have used Grow Strong Minerals for years. It is just a vitamin/mineral loose powder. You can use it to top dress or just put it out in a bucket and free feed it. It depends on the weight of the horse. It is 1-3 oz. for a 1100 lb. horse.
If you need more information, please call their Equine Specialist Leo Windschitl at 1-800-519-0658. He has been working with some of the top Miniature and Shetland Farms in the Midwest. His knowledge of horses is incredible.