I do about the same as @Ridgerunner :@NatJ @3KillerBs how do you kill them? I'm so embarrassed, I tried breaking one rooster's neck this morning like in the movie and it just flexed.
I've used a machete, a hatchet, or an ax. It needs to be a tool I can control properly, so I cut through the chicken's neck on the first swing, and do not cut myself or anything else accidentally.I use the ax and stump method. It doesn't have to be an ax, I use a hatchet, some use a machete or meat cleaver. The stump is important.
I am right handed, so I hold the chicken with my left hand: both legs and the big feathers of both wingtips. I pretend I have all the time in the world, being gentle and calm, tucking a leg or a wingtip back into my hand as needed. When the chicken is hanging calmly upside down, not struggling, but held securely by my left hand, I lay its neck on the chopping block, pick up my hatchet and line it up right, and make one hard chop that goes all the way through the neck into the chopping block.
If you are already comfortable chopping with an ax or similar tool, this method works quite well. If you are not comfortable chopping things, it's best to practice on other things first (like sticks of wood), or choose a different method of chicken-killing.