One of the biggest mistakes people make is increasing feed to bred mares. Unless they are loosing weight there is no need to increase their feed. You will end up with a mare who puts on too much weight and the foal gets too big and she has problems. Just keep feeding her what she is getting no more no less and you should be fine. If she is loosing weight then slowly increase it. On the same note if she is putting on too much weight then cut back a bit and do that with the grain and not the hay.
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