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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.
Breeding Age. Reproductive time frames will vary between different rats and/or lines of rats. Environment, health, lineage, and nutrition are a few of the factors that can affect reproductive life. Although it is not advisable, some female rats can be capable of breeding at 6 weeks.In rare circumstances breeding has occurred as early as 5 weeks. This is why it is best to separate the sexes when a litter reaches 5 weeks of age.s they age their reproductive organs will become less suited for pregnancy and birth and the eggs will become less viable. Male rats can impregnate a female as young as 5 weeks, although that is not common. They are able to breed for most of their lives.