What you describe as the pasture conditions looks a little bit like the
ones which the french people have in the mountains in south of France.
Here in Belgium the grass is too rich and I don't dare to put Karim more
than a couple of hours in the pasture. When I let him outside for the
whole day and especially in the spring, I experienced severe tying-up
problems. I was told by my vet that it was caused by the excess of
proteins in the grass.
I can imagine that the riders in similar parts of the states (I mean
with rich grass) have the same problems.
But I can hardly believe that you just take the horse from the pasture
everry day, then condition, then back in the pasture, then go to the
rides (sorry for the excessive simplifying). Are the horses not too
heavy with big belly in order to perform well?
regards from Belgium