1. 1. National Animal Health Monitoring System. Swine 2006. Part III: Reference of swine health, productivity, and general management in the United States, 2006. United State Department of Agriculture. 2008. Available at: http://www.aphis.usda.gov/animal_health/nahms/swine/downloads/swine2006/Swine2006_dr_PartIII.pdf. Accessed 14 January 2014.
2. *2. Daniels CS. Gas euthanasia methods in swine: process and physiology. Proc AASV. Omaha, Nebraska. 2010;447-450.
3. 3. American Veterinary Medical Association. Guidelines for the Euthanasia of Animals: 2013 Edition. Schaumburg, Illinois: American Veterinary Medical Association; 2013. Available at: https://www.avma.org/KB/Policies/Documents/euthanasia.pdf. Accessed 14 January 2014.
4. the time to loss of somatosensory evoked potential and spontaneous electrocorticogram of pigs during exposure to gases;Raj;Vet J,1997
5. 5. Danneman PJ, Stein S, Walshaw SO. Humane and practical implications of using carbon dioxide mixed with oxygen for anesthesia or euthanasia of rats. Lab Anim Sci. 1997;47:376-385.