I don't understand why you aren't allowed to breed the mares either.
DD, that's part of the deal from almost any rescue I know of in my area. And I do agree with this part, because many people get the horse just to breed without caring if horse is a breeding quality and (in some cases) can be bred at all due to age/health.
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."