Do you have space to make them grazing frames? This could stretch your grain further too.
I have made raised beds out of old tyres in the chicken run.
View attachment 2050459View attachment 2050460
Herbs in the first tyre and grass in the second. I have 12 tyres in the run altogether with a mix of grass seeds and oats in most of them. They are covered in wire mesh so that the girls can't dig them out but can peck at the green that grows through. Grass, flat leaved parsley and comfrey are very popular!
Interesting use of those old tires. Is there a better way to attach the wire to the tire? For example, would staples or screws with washers work better? I have been planning on making grazing frames out of scrap 2x4's, but using old tires like these would allow the greens to grow higher before the chickens could eat it. 2x4's are only 3 1/2 inches wide, and most tires I have laying around must be about 6 inches wide.
I personally don't care much for the look of old tires laying around, but it seems to me that I could easily dig out a spot of my deep litter in the chicken run, lay down the tire with attached wire, and repile the deep litter around and on top of the tire so you can't really notice it. My deep litter in the chicken run is about 10 inches deep at the moment. So it would easy to "bury" a grazing frame tire into that.
Anyway, the old tires would probably last a lot longer than wood sitting on the ground and rotting. Thanks for the idea. It's an option that I had not considered.