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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 can even deliver a litter of kittens sired by two different male cats if they have come into contact with more than one entire male cat at around the time that they conceive! During the first week after mating, the male catâs sperm will find the female catâs eggs, fertilise them and make the journey to the uterus, where the rest of the pregnancy will develop.