Michael Cox wrote:Sheep will avidly browse the regrowth of the woody material in your pasture.
Let the sheep into a small area of the pasture (not all 8 acres!) and give them a week to forage - they will strip bark off trees, eat any leafy material they will reach and generally clear up a lot.
Then come through the area with a saw and cut all the stems down to ground level. Again, the sheep will likely eat all the leafy tops for you, leaving you with thin poles you can chip, make bio char with or burn in the house in the winter. The bare earth thus exposed will quickly sprout lots of different species, including grasses. The woody stems will also sprout new leafy shoots.
Move the sheep off for a month to work on the next section then let them back in for a few days. They will hit the regrowth from the trees and their browsing of the other species will encourage a transition towards grasses. Repeat this cycle a few times and the tree species will likely die right back.
Your problems are likely to be due to insufficient animal density - you want them grazing hard on a smallish patch, then rotate them off for a month or so.
Michael Cox wrote:If you only have two sheep you will never graze it all sufficiently heavily to make an impact.