I've raised chickens all my life and had them free-ranged for as long as I can remember,
unsupervised, And not once have I lost my birds from predators  during the day while they're out foraging. At around 7:30 PM is when I put them away and I let them out at 7:00 AM.  I've got a few dogs and a Bernese for protection, But I also have lots of different fowls, My turkeys and guineas seem to keep the hawks at bay. I've ordered some African geese as well to serve as flock protection for my ducks, chickens, and pheasants.. And every now and then i'll set some traps out for foxes and raccoons to prevent any losses.