Pulling dead calves rates right up there. So does mink crap. Baby diapers can be pretty bad, probably because you're up close and personal to the source.
We had neighbors that raised mink, their farm was on one hilltop and we were on the next. Hauling hay through the valley between us on warm humid summer evenings as the air settled was enough to rip your eyeballs out. I remember they cleaned the barns once and spread manure on a field just after making second cut alfalfa grass. Damn cows wouldn't eat the 3rd cut hay from that field.
Dale
