Several weeks ago, we asked our neighbor to come "bush hog" our pastures. We didn't hear from him about it again for a long time, and I was beginning to think he'd forgotten about it. But this morning---surprise!---he just showed up and started mowing.
You can see here the one clean swath along the treeline where the tractor has mowed one pass around the field. Looking better already!
The plan is to use our own "bush hogs." I'll put the pigs into small areas of the pasture at a time, to encourage them to root up everything, including the plague of cedar trees. After they're done, we'll move them to another small area, and will reseed with good grass in the area they just worked over. If the pigs actually dig up the cedars, that will kill them so they won't come back, and we'll have a much, much more productive pasture.
Currently, the two sows, Cerridwen and Circe, are doing a fantastic job completely plowing up my main sheep paddock, digging through all the old composted hay and sheep manure. I don't think many parasites are going to withstand this kind of treatment for long.