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They're Usually Shredded Alive Rule :(
(i.imgur.com)
They're usually shredded alive almost immediately because they're seen as "waste" since they don't lay eggs
For some more context:
Dumb question maybe, but why not just let them get older and then eat them?
They're totally different breed designed to lay as much eggs as physically possible compared to broilers that are designed to grow edible muscle as much and as fast as possible.
More info here.