imho. I think it depends on the cat. Most will not bother full grown standard birds, even barn cats prefer mice to angry hens. Nearly everyone on here will tell you not to worry about it, they'll adjust and be ok. But, I brought home the most beautiful calico barn cat from a stable, they just gave her to me, and the next day she began stalking the chickens, that very sneaky stalk of the cat that lives only by it's wits. I soon realized that she was patient and would wait till the birds were asleep, like when they dust bath, and then pounce. Now, perhaps one time with an angry hen would have cured her, but I was not going to wait and find out. Especially because of my bantys. And this cat was freefed all the quality cat food she could hold. Nope, I took her back.