What had happened was, we had an Ivermectin resistant worm. Unfortunately we didn't realize this, or figure out the problem until alot of the horses were down in weight. We knew something was wrong, we just didn't figure out what.
They have all since been dewormed several times, and it seems the problem has cleared up.
Now the problem is, getting the weight on during the cold winter months. Other than the weight problem, they are healthy. They eat well, have good teeth, get good quality hay and grain, and all have nice thick winter coats.
I have them all on beet pulp now along with their grain and hay, which I have increased. A couple of them are also on ground flax. And all of them are on a vitamin supplement.
Anything else I should do? I cannot afford free choice hay. They get three feeding per day.