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Generally, laboratory mice become sexually mature between fi ve and eight weeks of age. Males of most. strains usually mature sexually by six weeks of age. DBA/2J (000671) and C3H/HeJ (000659) mice are precocious: females can. conceive when they are as young as 23 days old.
Deer mice begin breeding at only about six weeks of age, their gestation time is 24 days, and each female can produce up to eleven litters each year with about 2-9 young in each litter. The babies are weaned at 4 weeks of age and are ready to breed and increase the deer mouse population in another two weeks. Deer mice are carriers of the Hantavirus.