How long after the initial cut does the heart beat? I understand that this is mentioned as a benefit over stunning first because the heart continues to pump blood out of the body, but I was wondering if anyone knew how long it kept going.
I think that would depend on the bird's mental state (calm or terrified = how fast the heart is beating which would tell how quickly it would lose enough blood) as well as the severity of the cut (a nick won't cause as much blood loss as a good clean slice through the vein)
so a calm bird with just a nick to the vein would (or should) live longer than one with a good cut severing the vein completely.
I have read on here where someone botched the job a bit and the blood congealed enough that the bird lived.. (I don't remember if they decided to finish the job or not)