Zone 6 Winter evergreen forage shrubs/trees?

I just bought property in West Virginia on which I want to raise a half dozen St. Croix sheep and keep their offspring for meat lambs. The 1.6 acre section I want to raise them on has an old barn and a small creek on it. I would like to have four 0.4 acre paddocks to rotate them on with perennial evergreen shrubs/trees for winter forage so that I would not have to stockpile hay over the winter. The snow cover is usually 5" or less (although every few years reaches 2 feet). Buying a tractor, sickle bar mower, rake, and baler for only five acres constituting the other meadow is something I'd rather avoid. Weeping Tagasaste might barely survive, but I'd like to know of other winter evergreen forages I could plant that the sheep could eat in the snow in winter.