So My wife and I starting breeding rat 2 months ago, and today was killed are first time killing the the baby's. We got two letter's both with 13 baby's each, and the second letter will be ready for my snakes in a few days. We used the dry ice method, we left them in the ice chest 30 minutes with 1 pound of dry ice. Then we put them in little baggie's, and put them in the fridge. (was told to put them in the fridge for a few hours to help with nose bleeds) three hours later we took 2 warmed them up and put the rest in the freezer. So the one rat i gave to my female ball who takes food instantly. So my albino ball named Q-tip who take a long time to strike at food. So i'm sitting here doing the zombie dance with a baby "dead" rat, and i see it looks like it was starting to breath but i didn't think anything about it. i could not get Q-tip to take it, so i put him in back in the baggie then put it in some warm water. After about 10 minute i went back in the kitchen to check on Q tip and to check the temp of the rat and it's struggling in the bag under the water. So i pulled it out and put him in Q-tips tub and it starts walking around the tub acting like a baby rat should. Luckily Q tip took it after a few minutes.
Kinda a bad experience, felt really bad for the rat.