Thanks cw, I don't mind sharing my knowledge if I can addl a bit to a discussion, but my wealth... I wish my wealth was sufficient to share, but sadly...
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Firstly, I wouldn't re-freeze more than once, and although I think offering food refused by one snake, to another snake has the potential to spread disease, I have not had any new acquisitions to my collection for 6-7 years now, so it's unlikely to be a problem for my animals.
I certainly wouldn't withhold food for my feeder animals before killing them - there is absolutely no point in doing that. A full stomach won't make a scrap of difference to the decay potential of a rodent, except perhaps it's potential to bloat, but the gas is a natural part of the decay process anyway, and will cause no harm to your animal if it is fed during times of moderate temps. NEVER feed snakes during heatwaves such as we're experiencing now in southern Oz - the potential for regurgitation is far higher if the snake cannot thermoregulate properly, and their digestive systems can't keep pace with the rapid decay of the food animal in extreme temps. Not sure what you mean by "belowaromic" and "non aromic" bacteria - aerobic and anaerobic maybe?
I think the bacteria "problem" is way too overemphasised by keepers who understand little about microbiology - don't know much about it myself, but I do know that we are keeping animals which eat whole animal food, which is inherently loaded with a vast range of bacteria, internal and external. Any efforts to reduce the supposedly damaging effects of those bacteria by making the changes you suggest to feeding regimes etc are totally pointless. Efficient killing, 20 mins to allow the bodies to cool, packing and freezing in single layers, and quick defrosting are by far the best ways to ensure a wholesome, healthy food supply for your animals. Vac packing is a good idea - it removes the air from the fur and allows a far quicker freeze, and the food stay fresher for far longer in the freezer because of the removal of surrounding oxygen.
I have enough trouble bringing myself to kill rats which I have raised myself (I think rats are very nice, intelligent animals) without subjecting them to starvation for a day before killing them.
Jamie