If you 're converting it to deer cover, I'd plant a sprinkling of spruce, crabapple and Washington Hawthorn in that old pasture. Those 3 will give you a good foundation for cover & you can add some other shrubs or grasses as well. The crabs also drop apples for handy food. Spruce for bedding / thermal cover, haws draw grouse like candy and make great bedding for the deer as well. Bonus : hawthorns drop little red berries that sprout into LOTS of free seedlings to either thicken up where they sprout or be transplanted to other spots !!
That is some awesome looking country you have there !! Nice batch of deer to have hanging around post-season too. Next summer / fall ought to be sweet.