I don’t think horse poop is as bad but the. chicken house tractors I worked on a couple times were the rustiest/wire problemist things I’d even seen. After two times I said nope not touching that stinky thing again.
Bought our JD 870 in the fall of 1987. 5-11 horses. Manure moved from manure pile to compost pile once a month. Tractor stored outside. Bucket has holes.