The Dark Agouti inbred model was developed by the Agricultural Research Council Institute of Animal Physiology at Cambridge. Zentralinstitut für Versuchsteirzucht of Hannover Germany received stock. M&B A/S (now Taconic Europe) received stock in 1990. The rats were derived by embryo transfer in 2004 at Taconic US. The Taconic foundation colony was at F28 in 2005.
* Genetic monitoring of the foundation colony following derivation identified a mobility variant of Es2 and ongoing evaluation of this marker will continue.