Update: I downgraded my test world to 15w51b, and the chickens took the normal amount of ticks to die, and left their drops. Seems to be an issue in the latest snap shot.
I am running the latest snap shot. I have built both the torch burnout off a competitor and a piston tick limiter dispenser set up to try and kill chickens. They light on fire and die in one tick. So is there a bug with this method?
I built this for a test to start then I built the piston version to see if it was just the auto design.
Any help would be appreciated.