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Euthanasia of mouse fetuses and neonates
Brenda A Klaunberg1, James O'malley, Terri Clark
110 Center Drive, Bldg 10, Room B1D69, NMRF, DIR, NINDS, NIH, DHHS, Bethesda, Maryland 20892, USA.
Contemporary Topics in Laboratory Animal Science
|October 6, 2004
Summary
Determining optimal rodent euthanasia methods is crucial. Carbon dioxide asphyxiation is effective for neonatal pups, while pregnant adults benefit from specific anesthetic or physical methods.
Area of Science:
- Veterinary Medicine
- Laboratory Animal Science
- Animal Welfare
Background:
- Establishing humane euthanasia protocols for laboratory animals is essential.
- Common euthanasia methods require evaluation for efficacy and ethical considerations in different age groups, including fetuses and neonates.
Purpose of the Study:
- To assess the suitability of common euthanasia methods for fetal and neonatal mice.
- To identify humane, rapid, and reliable euthanasia techniques minimizing pain and distress.
Main Methods:
- Evaluated six euthanasia methods (halothane, CO2, sodium pentobarbital, potassium chloride, cervical dislocation) with/without anesthesia.
- Tested on gravid mice (E14-20) and neonatal pups (P1-7, P8-14).
- Assessed cardiac arrest using noninvasive echocardiography.
Main Results:
- No tested method effectively euthanized fetal mice.
- Halothane inhalation was unsuitable for tested age groups.
- CO2 asphyxiation proved most efficient for neonatal pups (P1-14).
- For pregnant adults, IV potassium chloride, CO2 asphyxiation, and cervical dislocation (with/without anesthesia) were excellent.
Conclusions:
- Specific methods are recommended for different life stages in mice.
- CO2 asphyxiation is effective for neonatal mouse euthanasia.
- Anesthetized potassium chloride, CO2, or cervical dislocation are suitable for pregnant adult mice.