Strains of the Norway species of this animal are the ones used in labs
[DOC] [TLE] Breeding Guide: Breeding Methods - Rat Guide [PAR] Mar 26, 2006 ... Inbreeding is used extensively in the breeding of many species and can ... Inbred 
lab strains are often achieved by breeding brother to sister in each ... if the correct 
animals are chosen for breeding: the ones that somehow did ... King also started 
an inbred strain from wild Norway rats that she caught locally.