The ARC Policy on Tissue Collection for DNA Extraction for Genotyping in Rodents (formerly Tissue Collection for DNA Extraction for Genotyping in Mice) has recently been revised; the updated Policy is available at the Tissue Collection for DNA Extraction for Genotyping in Rodents web page.
The main change pertains to use of anesthesia for ear punching/snipping. As noted in the revised Policy, anesthesia is not required for mice at any age, but is required for rats over 3 weeks of age.
Please contact the Office of Animal Research Oversight at 310-206-6308 or oaro@research.ucla.edu if you have any questions.