Regurgitation if regurgitation (you should know by the smell and state in which you found the rodent) needs to be addressed as followed.
No feeding for a period of 2 weeks, it is very important feeding too soon after a regurgitation could lead to another one and you want to prevent that at all cost. When feeding feed a single smaller prey.
Now if the animal does regurgitate again in 2 weeks you will need to assess a few things.
Stress - Temps - Prey quality - and have a feval done by a vet because your animal is captive bred does not rule out internal parasites at all
or being less likely that's a huge misconception. You feed fresh kill and the prey you are feeding could be loaded with parasites and that is not uncommon at all.
I would not worry about rats raised on pine as suggested in the thread I have been breeding rats and mice on pie for a decade and this does not cause respiratory issue and or premature death in feeders, countless of breeders also breed their feeder on pine.