I presume that teeth have been checked?

Your mare is getting on a bit - is she finding masticating difficult? I don't know if you already are, but for the older horse's I find that making the feed wet can help so that it requires less chewing ... one of our oldies literally had their feed as a mash.

I swear by Simple Feeds - they are all forage based feeds so even my even my very hot headed TB is (relatively!) sane.

If I were you, I would also consider changing bedding - paper or shavings is generally much less appetising for them!

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