I’ll stick it in a thread so it doesn’t get lost…
Instead of chasing cattle and hassling them via noisy helicopters once in a while, could it be possible to train them to follow a drone helicopter? Send out drones to deliver treats, so eventually the cattle associate the drone with the treat. Get them to follow it for longer and longer distances before they get the reward. Then at muster time slowly bring them in closer and closer to the final open.
Are there any particular treats cattle might like enough to trek behind a drone for?