Rats should be able to push themselves up (and have control over their body
temperature) about 4-5 hours after the last dose of anesthesia. And 5-10ml
of Lactated Ringer's saline (0.9% NaCl) is also typical.
If your rats aren't waking up at all, some things to consider in your case
could be:
Anesthisia
-Are the rats receiving the correct dose of anesthesia before surgery
(should be about 40-80mg/kg Ketamine with 5-10mg/kg Xylazine)?
-And if your surgery lasts more than an hour, are they receiving the correct
maintainance doses (maintanance doses are lower, usually the inital volume
multiplied by about 0.38)?
Temperature Maintanance
-Are they kept warm (but not too warm) during the surgery?
Blood loss
-Are the rats bleeding a lot during your surgery, and is the bleeding
stopped before the end of surgery?
Hope this helps,
Mike Smeltzer
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