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I read on BackyardChickens.com this morning that you're not supposed to use pressure treated (at least the toxic type) around livestock, especially chickens, who like to peck at and try to eat just about anything. Now the newer pressure treatment chemicals aren't harmful, as copper, creosote and other nasties were in the old style.
I wouldn't use pressure treated wood (or wood of any kind, for that matter) for a parrot enclosure because parrots do chew wood. But chickens don't. As long as the wood is intact, not rotting or splintering, there's really no way for a chicken to get her beak into it.