We've an AG Dispenser that goes on front of our Mustang skid-steer for spreading sawdust into cubicles.
Works fine, even spread, speeds up a dusty, time consuming job and we've noticed a decrease in the amount of sawdust used. We tend to use it every 3-4 milkings and just brush some loose forward, when cleaning off the mats, other times.
Only down-side is because of our open Mustang and Yorks-boarding, we're moving into the dust all the time it's spread and so we've to wear a (very fetching!) full face respirator! Tractor with cab recommended.