I think it just comes down to the individual personality of the cat. They are all soooo different. Our cat was caught as a feral kitten with her mom at about 5 weeks of age. We have a program in our area where the feral moms are caught, their kittens adopted out, then the mom is spayed and released back to where she was found. We adopted her at eight weeks, and she was an indoor only cat for about 8 months, but she had such a desire to be an indoor outdoor cat that we caved. She has had so much fun being able to come and go. She has taught herself to be quite the hunter even though she has access to grain free top of the line cat food. Like another poster mentioned, she just doesn't eat them. Leaves them laying around. She acted very predatory to our chickens at first. Until one of the hens turned around and showed her who is really in charge. Now she just messes with them. Stalks them, jumps out at them, etc. but the funny thing is that the chickens are not afraid of her, they just stand their ground, and sometimes chase her off. It is quite a sight to see a cat, 8 chickens and a giant chocolate lab hangin in the yard. Anythings possible, so I say go for it, natural predation is much better then traps or poison in my opinion. Just keep an eye on everyone in the begining and I am sure your chickens will put the cat in its proper place soon enough!