I think amount of hay wasted will be determined by how many cows a person is feeding per bale of hay. My neighbor rolls out one bale of hay for 30 cows with calves and has very little waste. I on the other hand only have 12 cows and I put hay rings around the bales. How often one feeds and how much also determines amount of hay wasted
We also have some pastures with longhorn cattle. No way we could use hay rings with those horns.