A couple weeks ago I lost one of my female breeder rats unexpectedly due to birthing complications. She died after having a 16 pup litter. Her sister (bin mate) had her own litter of 15 two days prior and adopted all the pups (many did not make it BTW). Anywho, this totally drained her and she did not throw another litter for 2 months. I was forced to order F/T rats online due to lack of breeders. To the point. Last week 2 of my big boys were in shed but usually eat in shed so I thawed them each a nice size 70-80 gramish rat. Both refused so I refroze. This week when I thawed them they looked a bit off (discolored skin) but I decided to feed anyway. Thankfully, one of the males likes his F/T food just laid in front of him. Unfortunately, the other one likes to strike his and constrict. Well, this action led to rotten rat guts ALL OVER everything. Disgusting! Both rats were rotten inside (cut the other open as the other snake refused it). Within my own stock, I refreeze all the time (only once though then discard) and never have any issues. So lesson is... do not refreeze store bought F/T rats. I think they may have been "refrozen" once (or maybe twice) before they got to me. BTW....I got them from a huge if not the biggest F/T distributor.