You should never, ever, ever refreeze meat of any kind. Even meat you would eat yourself. Bacteria can grow at astounding rates in warm meat and a second freeze will not kill it all and make it safe to eat. Please don't refreeze mice/rats as this is an entire carcass which contains all kinds of bacterias already. The second the body dies, it begins to degrade and bacteria begins to spread through the system. If it's immediately frozen this process is 'paused' so to speak. Once the carcass begins to thaw, this process starts up again, but this time faster because of the billions of cells that have burst do to being frozen and shredded by ice crystals. The meat or carcass should be used within 12 hours(at most! sooner is always better) of starting to thaw because of the increase in bacteria growth and in casrcass' the organs breaking down and beginning to 'rot' the body from the inside out. Just because it looks ok and smells ok, DOES NOT MEAN IT IS EDIBLE. Please, please, PLEASE DO NO REFREEZE ALREADY THAWED MEAT
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