The Lewis rat is a descendant of the Wistar Commercial Stock of rats. The Wistar can be traced back to Donaldson who established a colony at the Wistar Institute. The rat was cesarean derived in 1999 and fostered onto CVF® rats. Colony histories contain some possibility of error. This information is provided to the best of Hilltop's knowledge.
Viral Antibody Profile
The coat color of the rat is albino. The rat colony is an inbred colony. Animals are propagated by brother x sister mating. The colony at Hilltop Lab Animals, Inc. is a closed colony and has been so since 1999. Closed colonies develop qualities causing the rats to be uniquely suited to certain types of research.