I have about 15 chickens that free range 100%. I don't really keep count. My chickens roost in the top of my tiny barn and are free to be where they want at all times. I've had a few losses which sucked but thats life. I've killed a few predators and that definitely helped. I got a new dog which also helps I think, I'm soon to get a 3rd. I don't feed my chickens, besides 15 acres of forest to forage they just get whatever they can steel from the ducks, goats, pigs, and rabbits.