The Long Evans outbred model was developed by Dr. Long and Dr. Evans in 1915 by intercrossing Wistar Institute white female rats to wild grey male rats. Simonsen Laboratories received stock from the University of California Berkeley in 1949. The rats were derived by embryo transfer in 1975.
ARC received unrelated stock in 2015.
Strain from transferred from ARC to Ozgene ARC in 2023.