Most fescue hay isn't as good as it looks. You get about 3-4 days in may to bale it, or you wait till June.
But for wintering dry cows they can survive on it, although some supplement helps. Wish I could graze stockpile all winter, but with mud and land prices, hay is cheaper.
Now if you want to grow your own supplement, I would do some acres of straight red clover. It can be a pain to bale, but it doesn't have to be pretty and still get 12-14% protien. People worry about bloat, but I've been feeding straight dry clover for quite some time without problems. Unroll in you pastures and get some 'free' clover seeding.