Dwango→Heston→N(Jay) 1950→Hokkaido University, Faculty of Science(Mk) 1956→National Institute of Genetics(Ms) 1958→Hokkaido University, Laboratory of Experimental Animal Science(Hok) 1959, F68→Hokkaido University, Center for Experimental Plants & Animals(Hok) 1982,F131
Strain characteristics
Small size, good breeding performance, large litter size, liver obstacle, lack of bitamin B.