I sell live. A guy asked me to sell frozen, but I would have to put live chicks in the freezer to freeze to death, because I can’t cut their heads off and sell chick chunks. I have no problem culling a sick chick or an adult for food, but murdering chicks in an inhuman way is not for me.
Years ago I raised rats to feed my pet snake. I would have a litter, raise it to the right size and then freeze a bunch, and let the parents live separate until I had 3 left. I used a small gas chamber with a paintball canister I believe, to provide the gas. I put a bunch of treats and stuff in and they would happily eat, start yawning, and drift off to sleep peacefully. Then one day, one wasn’t gassed enough, and it leapt back to life and escaped. That jerk lived in my house for 3 weeks before I caught it, evading the snap traps, sticky traps, humane traps. I fed the parents to the snake and stopped raising my own rats.