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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.
In addition they will feed on such animal matter as insects and meat when available. These mice are exceedingly prolific breeders; as many as 13 litters can be produced in one year. The number of young per litter averages about six. The gestation period is approximately 19 days, varying from 18 to 20.At birth the young mice are nearly naked with their eyes and ears closed.n addition they will feed on such animal matter as insects and meat when available. These mice are exceedingly prolific breeders; as many as 13 litters can be produced in one year. The number of young per litter averages about six. The gestation period is approximately 19 days, varying from 18 to 20.