Mulberry is just a big ol' woody weed - grows fast, provides shade in a hurry, and the cows will enjoy any leaves that they can reach. I've got 3 or 4 planted around the corral here, and a couple more around the barnlot.
There are some folks who are even exploring different mulberry selections as a source of forage for ruminants, seeing which work best in a coppicing program.
And, if you plant or graft them over to a good fruiting selection like Silk Hope, Lawson Dawson, etc., the fruits are a tasty treat for man or critter. In my experience, those trees benefitting from the cows 'lounging' (and other things) beneath them, make larger, juicier, tastier berries than the same variety growing in my lawn or orchard.
Also, if you decide to take them down at a later date, they make decent fenceposts and firewood.