My wife and I have had many barn cats, we call them our coop cats. We keep our chickens within a coop and yard. We start with kittens at 2 months old. We have a place for them in the coop that is not accessible to the birds. We feed and water the kittens there and only there. They can get out of the chicken yard, but, its not easy until they are grown. We also socialize with them in the coop and yard and return them to the coop at night until they are about 6 months old. After 6-8 months we continue to feed them in their space in the coop, but, do not try to confine them at night to the coop, they have their own chicken proof entrance. We have had good luck using this method with maybe a 70 - 80% success rate with raising cats that prefer to do their hunting in and around the coop. We have not had any cats attack the chickens, although they will swipe at any bird that tries to take its catch.
I hope this helps.
My wife says that girls work best for this. She says the boys, even when "fixed" like to roam to much.