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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.
Cats also have an estrous period 1-6 weeks after giving birth, so a female may be nursing one litter while pregnant with another. A cat can give birth to anywhere from 1 to 6 kittens. These kittens can start mating and producing more kittens at the age of around 6 months. A male cat can impregnate countless female.