Now, I've hardly done much to refute charges of anthropomorphism - but am I bovvered? I'm not projecting human characteristics on to dumb animals - I'm saying I really don't see that much difference in their hopes and fears, behaviour and petty foibles. If one actually lives with chickens, it's a lot harder to treat them as mere objects.
Their preferences are astoundingly obvious, so what possible excuse could there be for giving them any less? If they like greens, why give them pellets? If they like sunbathing, why pack them into a tiny, noisy, smelly place with no natural light? If, as I suspect, the answer is something to do with the "efficiency" of food production, then the notion of efficiency is horrible, incompetent, brutalised and brutalising, and it's certainly not in the interests of chickens at all. And I'm not sure that our ethical notions are all that more advanced than chickens'.