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2015 ; 4
(7
): 760-3
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Is "cooling then freezing" a humane way to kill amphibians and reptiles?
#MMPMID26015533
Shine R
; Amiel J
; Munn AJ
; Stewart M
; Vyssotski AL
; Lesku JA
Biol Open
2015[May]; 4
(7
): 760-3
PMID26015533
show ga
What is the most humane way to kill amphibians and small reptiles that are used
in research? Historically, such animals were often killed by cooling followed by
freezing, but this method was outlawed by ethics committees because of concerns
that ice-crystals may form in peripheral tissues while the animal is still
conscious, putatively causing intense pain. This argument relies on assumptions
about the capacity of such animals to feel pain, the thermal thresholds for
tissue freezing, the temperature-dependence of nerve-impulse transmission and
brain activity, and the magnitude of thermal differentials within the bodies of
rapidly-cooling animals. A review of published studies casts doubt on those
assumptions, and our laboratory experiments on cane toads (Rhinella marina) show
that brain activity declines smoothly during freezing, with no indication of pain
perception. Thus, cooling followed by freezing can offer a humane method of
killing cane toads, and may be widely applicable to other ectotherms (especially,
small species that are rarely active at low body temperatures). More generally,
many animal-ethics regulations have little empirical basis, and research on this
topic is urgently required in order to reduce animal suffering.