Quote:
Hmm, ok - perhaps it depends on the brand? I don't actually have any in front of me, but I recall from 5+ years ago that when I was looking for diethyl ether is was very hard to find in over-the-counter sources.
One great way to know for sure is to pick up the MSDS for your fluid from the mfg or their website - it will give you the CAS number for the ingredients. The good ether is CAS #60-29-7 while the bad stuff is CAS #8032-32-4.
All that said... I personally would still use CO2 over ether. There has actually been some good research done on the subject (can you tell I've had to cull my first chick recently? I've been reading...
) such as:
http://la.rsmjournals.com/cgi/reprint/22/1/67.pdf
The behaviour of chickens, mice and rats during euthanasia with chloroform, carbon dioxide and ether
J. K. BLACKSHAW', D. C. FENWICK, A. W. BEATTIE & D. J. ALLAN
Department of Animal Sciences and Production, and Department of Physiology and Pharmacology, University of Queensland
Summary
Euthanasia of chickens, young and mature rats, and mice was assessed using chloroform, carbon dioxide and ether. Behavioural patterns were recorded to give some indication of the stress involved. Carbon dioxide induced collapse faster (11,2 ± 0·4 s) than chloroform (18'9 ± 0,4 s) or ether (> 60 s). With regard to the time taken to death, in carbon dioxide mice had the shortest time (48 ± 10 s) and mature rats had the longest time (135 ± 10 s). In chloroform, the only difference was the delayed onset of death (127 ± 10 s) in the chicken. Behavioural patterns were similar for the chicken in carbon dioxide and chloroform, except for wing flapping, even when unconscious, in carbon dioxide. Chloroform is recommended as more aesthetically acceptable for euthanasia of chickens. Carbon dioxide is recommended for the euthanasia of both rats and mice, considering behavioural criteria. Ether is unsuitable as a euthanasia method as it is dangerous, slow acting and an irritant.