inbreeding

[Brandon Osborne]

There may be an easier way, but I am 100% sure that my mice are not inbred, and I think that makes for healthier mice. JMO

~ Michael

Not necessarily. Some strains of inbred mice are actually very hardy and produce very large litters. Harlan has strains that produced average litters of 14-16 and adults retire at around 60 grams. Sometimes outbreeding will weaken the genes as mentioned above, as well as the immune system.