Sorry, have been very busy lately. I don't know if I can answer all of your questions, but The mares are out in the pasture, which is land that has never been touched (except for our landlord used to have cattle on the land) but that is it, I was there for the births, and as soon as the foals could not get out of the sack, I broke it myself. NO, The colts was not starving, and no one comes near the mares when they are pregnant, so they couldn't have been fed something mares shouldn't eat. We have always bought the highest quality of mare and foal pellets, and there was no difficulty with any of the old mares my father an I used to have.
Thanks for all the different opinions and articles, they are very interesting. And if we do have another foal with the same problem, I will definitely do some intense researching. =)
Never discourage anyone if they are making progress and learning, even if it isn't at the pace everybody else is going.