We've fed it to livestock in Mills County, it gets delivered 15 tons at a time and sits in a pile on the ground the whole winter. Yes, it gets a few moldy or hot spots but stays pretty palatable even after a few months.
My suggestion would be to loosely feed it in hog wire racks so it can breathe a bit, or to find a way to cover what you are putting out. Sadly, it's been discovered as a good food source. We used to be able to get it for $100-125/ton, now it's nearly as high as processed cubes.
This is the wire I'm referring to: