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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.
A cockerel will start to practice mate at about 8 months old with most breeds. They are not real good at it for the first month or so as it take finnese and balance. The male must stand on the hens back or saddle area before mating and most young males cannot master that right off. 1 person found this useful.