Facts About Mice and Rats

Mice

Rats

Lifespan

1.5-3 years

2.5-3.5 years

Cage temperature range

65-80°F

65-80F

Relative humidity range

40-70%

40-70%

Breeding age

50 days (male)

65-110 days

50-60 days (female)

Estrous cycle

4-5 days

4-5 days

Gestation period

19-21 days

21-23 days

Litter size

10-12 young

6-12 young

Weaning age

21-28 days

21 days