Short answer: They'll eat it.

Longer answer: Nothing horrible will happen, you won't get chicken zombies or mad-chicken-diseased chickens. I presumed your question meant cooked chicken, the same as what humans would eat: Fried chicken, chicken nuggets, chicken strips, stir-fry chicken, etc., but to take one simple example: Lots of processed animal food is made from chicken (dog food, for example). You can feed chickens chicken-based dog food and they'll totally eat it.

As long as one does not eat diseased animals, and as long as the food is cooked and such, eating a member of your own species (cannibalism) has one distinct advantage over eating any other random food: Any given animal already has all of the necessary enzymes to completely digest itself. It's a necessary part of life that an animal have all of the enzymes needed to process its own cells. You can't digest the hulls of corn kernels for example, as anyone who has looked in a commode can tell you. But if you were to eat a member of your own species, you'd at least be able to digest them. The same holds true for chickens. So very bluntly speaking, if you were to feed chicken to your chickens, they'd pretty much thrive, provided you also feed them water and food or supplements with any other nutrients they may require.

Fun thing to do on a boring day: Toss chicken-skin scraps from your KY-Fried to the pigeons in the park. They'll DEVOUR it.
Source(s):
http://www.biology-online.org/articles/digestive_enzymes.html


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