I dunno if it's actually true or if people follow it, but I was told not to feed my Ball while she was shedding. My boa however, wants her food on the dot every 14 days, shed or not. And there doesn't seem to really be any side-effects... But that's just my experience.
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1.0 Husband
0.1 Colombian BCI (Satin)
0.1 Spider BP (Loki), R.I.P... We will never forget you...
Many Balls will eat in all stages of shed. Depends on the animal.
x2 I have some balls that will eat no matter what time of day and what stage of shedding or non-shedding they're in. I have some that won't eat if they're even close to a shed.
My boas however...will eat any time any day. I think if I threw the rat in still frozen they'd eat it!