Ideally I could eat animals that are happy and content then instantly dead without ever knowing what's happening. If we could breed them with little switches in their brain stems that can be turned to Off via a wireless signal ...
I'd want that. That would be great. Press button, chicken drops dead. Takes 1 microsecond to die.
The more important question is how self-aware is the chicken? Does this self-awareness give it rights? Do rights stem from self-awareness, or from humanness, or is it arbitrary based on a wishy washy feeling of "Hm, that looks too severe. Oh but that other thing, that's okay". Or is how we treat them based purely on how much they can take before the taste becomes too poor for us to bear?
Ultimately the point is that meat is tasty.