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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.
How do they reproduce? Deer mice are polygynous, meaning that male deer mice each mate with more than one female. Mating System; polygynous; polygynandrous (promiscuous) Females deer mice can have many litters in a year. In the wild, reproduction may not occur during winter or other unfavorable seasons.