I learned this at school(of all places) how to safly and huminly knock a chicken out
Step 1: All you need to do....
Once you have gotten hold of a chicken(your on your own there)
stick its head under its wing, hold the wings so that they are flat on its body and swing the chicken in a large circle for about 2-3 minutes. it works best if you swing fast on desent and slow on the asent.After 2 minutes of contious swinging the chicken should have pass out, if not they walk funny for a minute