Mutation causing diabetes mellitus in a closed colony of outbred Wistar rats at Bio-Breeding Labs, Ontario, Canada in 1974 (Chappel and Chappel 1983). To Worcester in 1977 where inbreeding began. Introduced to Tokyo Medical College in 1983.
Mutation causing diabetes mellitus in a closed colony of outbred Wistar rats at Bio-Breeding Labs, Ontario, Canada in 1974. To Worcester in 1977 where inbreeding began. Sublines of diabetic-prone and diabetic-resistant animals have been developed, and there are also subline differences in the incidence, age of onset, untreated survival time of diabetes, leucopenia and body weight gain which can be attributed to genetic factors