> Introducing new definitions like yours is just an implicit attempt to advance anthropocentric exclusivity, pretty much the re-worded equivalent of that religious dogma of "only humans have soul"
Oh man, I hope you realize how /r/iamverysmart you sound right now. The poster you're replying to has a very good point that is often discussed by philosophers[1]. Your anti-theist quip doesn't serve your point either. It just makes you seem like more of an asshat.
Let me explain: since pain is (trivially) a subjective experience, does X still experience pain if it no longer has the capability for a subjective experience? For example, if I got hit by a car and ended up brain dead, it's intuitive to claim that I would no longer be able to experience pain even if you decided to cut off one of my limbs.
Was the chicken in a similar state of being? I don't know -- maybe, but probably not. Either way, it's an interesting question.
[1] http://plato.stanford.edu/entries/pain/#second