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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.
Begin to breed mice at a relatively early age. 1  Females can breed from approximately 6 weeks old. 2  Males will generally stop breeding around 1 year old.here are several reasons one would breed mice ranging from a desire to raise them as pets to breeding them as snake food. Whatever the reason for the breeding, there is a specific process for the most humane, safe and effective mouse breeding.