Cherie, so according to your theory, alfalfa should be a good hay to feed, correct? Lots and lots of calcium there!
I have a little bit of doubt in your theory because my mare was eating about 75-100% alfalfa hay from months 3-11 of her pregnancy (when I bought her I figure she was around 2 months pregnant) and she had a big, bouncing, beautiful colt, with one deformed leg.
If anything, she was probably getting too much calcium. But I did what I could to the best of my ability and knowledge at the time. Before I bought her, she was on pasture.
Actually, my theory is that my foal's deformity was positional, because that's what it looks like to me. Like the the leg was in a cramped position and grew sort of warped.
I dunno. I guess I just don't know if calcium really is the missing link, because then none of us who live in the west and feed almost exclusively alfalfa would ever have any problems, right?
I have another question, instead of going through all the trouble of trying to re-formulate a mineral supplement with more calcium, why not just use the Purina 12:12 and add a significant amount of alfalfa to the horse's diet? That is more or less what I am doing. I am feeding about 60/40 alfalfa to bermuda, with a free-choice mineral block and white salt block.
My baby still chews everything in sight though!