A BBC documentary about KFC called Billion Dollar Chicken Shop includes a visit to one of the British farms that supplies the firm with chickens.
After the birds have reached the required weight, the chickens are gassed, cut into nine pieces, and then sent to a centre for chilling.
KFC claims its chicken is "fresh" because it goes from shed to store within 48 hours.
Animal rights campaigners say the chickens endure "a wretched existence".
Animal Aid director Andrew Tyler told the Daily Mail that "they endure a wretched existence in giant windowless sheds stinking with ammonia. A very large number die from starvation or dehydration. About 900 million of these birds are produced in country each year, [and] about 30 million plus die in the sheds."
But Andrew claims that the chickens in the shed are healthy.
In the documentary, he picks up a chicken and shows it to the camera. "We have beautifully clean feet and that's a good sign that these birds are healthy and are being grown on good litter," he says. "And you can see that this is a good healthy chicken."
"I can't think there is anything better than sat in a chicken house looking at chickens, and I mean you can see for yourself, they look absolutely fantastic," he adds.
You can watch the trailer for the show here.
