Marking
                    Berkshire
Reference information
| Name | Berkshire | 
|---|---|
| Genotype | H/h, or H/hi, or hi/hi, or hi/h, or hi/hn | 
| Mandatory picture? | No | 
| Frequency (all time) | 8.68 % (4,344 rats) | 
| Frequency (in the last 2 years) | 13.38 % (247 rats) | 
| Average lifespan (all causes) | 23.3 months (♀: 23.5 months – ♂: 23.2 months) | 
Description
N/A.
 
                    























