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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.
Groundhogs have to know just when to emerge from hibernation to mate so that their offspring will have the best chance of survival. âMost matings happen in a ten-day period in early March,â says Zervanos.