Chickens are electrocuted or the heads removed in the 'civil" world. We would think that anything would feel some pain if the brain is not shut down. Major trauma kills instantly, but your brain has to receive the message to die before it can die.
If a knife is sharp enough, the chicken won't feel it (just when
you get a papercut, you notice it later after a few seconds.).
These few seconds are crucial when it comes to pain.
Normally when you slaughter an animal, you slice his throat.
When done with a sharp knife, the animal will not get oxygen to
it's brains, and he will be incapacitated within 3-4 seconds. The
cut consists of a swift, deep incision with a sharp knife on the
neck, cutting the jugular veins and carotid arteries of both sides
but leaving the spinal cord intact. Although he is not dead (it's
heart still pumps), it can not feel anything.). It is very
important not to cut the spinal cord, otherwise the animal will
On second note: Jewish and Islamic beliefs state that the animal
must not suffer and that is why they slice the throat. Then they
hang the animal upside down so all blood can go out of the body.
Basically when you sliced the throat, you let the heart do all the
work by pumping the blood out. This is one of the main conditions
of "Kosher" or "Halal" meat.
Conclusion: No it does not feel pain, unless the knife is not sharp enough and you cut the spinal cord. Only slice the throat (notice how you do not behead it, but a small slice in the throat will suffice.)