I would 100% recommend having a separate tack room and feed room. The mice will find the least little dropped bit of grain, and then they will want to set up house in your adjacent blankets.
Separate tack room preferably a bit aways from the grain, and don’t let anyone keep human or animal treats in the tack room.
My barn is self board, and set up so each boarder has an 11 by 11 foot loft (same size as the stall) above their stall. In there we keep up to 2 tons of hay, our tack, and our grain, and our winter tires and our broken pitchforks and etc etc :).
Mice become a real challenge because they are running the length of the entire loft in and out of individual lofts, getting any spilled grain, and the Timothy seed heads, and of course looking to settle down and raise multiple families in anything they can get their teeth into. Dust also is a huge problem. Anyhow we probably have the worst setup possible in terms of dispersed rodent attractants!
I use the IKEA stacking recycle bins for grain, they take a 50 lb bag of anything quite nicely. So far they are rodent proof. But I’m only feeding one horse out of them, so I don’t go through more than one sack of anything per month. If you had ten horses you would want bigger bins of some kind.
I can’t let unopened bags of oats or flax sit on the floor because the mice will find them. They don’t bother the beet pulp or alfalfa cubes.
I was at a barn with visible rats last winter
but because the feed room was away from the tack room, they really didn’t bother us there.
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