Found the pdf. "
Euthanasia of animals used for scientific purposes (Currently under revision) - Australian and New Zealand Council for the Care of Animals in Research and Teaching"
http://www.adelaide.edu.au/ANZCCART/...Euthanasia.pdf
Recommended:
Barbiturates.
Acceptable with reservations:
Stunning + destruction of brain (the method I mentioned)
Not acceptable:
Inhaled agents - Halothane, isoflurane, methoxyflurane (reason: able to hold their breaths -> protracted induction)
Hypothermia - crystal formation painful
Decapitation alone - doesn't cause rapid unconsciousness