I actually do have a motorised rototiller, but I don´t really like using it as it annhilates the soil structure. Having said that, my two little Wessex Saddlebacks have done exactly that. Every morning when I stroll on over to feed the little pigs, they can be found ear deep in the soil and happily rooting away for whatever tasty entree they can find.
Some breeds of pigs can be very destructive to your land...our two go above and beyond the call of duty. They are hard core excavators, they till, they toil, they turn and they upend. I wouldn´t be surprised if we find our clay pan, which normally sits around 2 meters underground, to feature as the newly installed topsoil layer.
The biggest issue with this newly crumbed layer is the loss of soil moisture...and the fact that when it rains, it ceases to that have lovely crumbly texture and becomes a mud slick. Do the pigs mind? HELL NO!!!! It then becomes the worlds best wallow. Of course, it makes feeding the pigs hazardous as it clumps to the bottom of my wellies and suddenly I am engaged in a very unwanted weight training regime whilst trying to fend off two hungry little piggy cannonballs hell bent on getting the food bucket down to their level immediately. Me suddenly hitting the deck with the bucket is merely a further impediment to accessing the bucket. Feeding pigs in the rain is a hazardous sport. You must be quick, agile, strong and cunning. I often lure them out the gate into their general run then quick as a flash head on into their feeding/sleeping run, nimbly closing the gate behind me, deposit the goodies, open the gate and then duck out after they have sped into the run.
Once the piggies have been dispatched into the freezer we will engage in a very enthusiastic reforestation program for the pig run. We have great plans for that churned soil. It involves alot of pumpkins, zucchinis, cucumbers and sweet taters. That little piece of land deserves a living mulch layer. Also, it will provide some foodstuff for the next batch of piggies.