The sheep are doing outstanding work in the apples. So much so that I had to take a couple "before and after" pics to show you.
Looking down the hillside at 2 rows of apple trees. The second row is obscured by the unmowable stuff under the first row of trees.
To my astonishment, they eat not only the tops of thistles and wild parsnip; they ate the leaves off the invading honeysuckle and sumach, and pruned the apples up to boot.
If we'd had to clear all that brush/weed stuff by human labor- there's really no question it would have take twice as much work, time, and sweat as it took to set up the mesh fence and move the sheep.
And the sheep seem to be getting big and fat off the process.