are you absolutely positive on your husbandry, or your f/t thawing process? i'll assume so:
bad rats are absolutely a possibility, especially how you describe them basically falling apart. TBH that's nasty lol.
i actually got a batch of feeders a year ago and they STUNK; looked fine, thawed fine, smelled like butt. my CG female refused this batch entirely. others ate, but i felt she was a Warrant Canary and i decided to replace my stock of weaners.
she ate fine from those.
EDIT: my only regurge was from a runaway heating element which was easily identifiable, so idk much about regurge from feeders specifically.
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