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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.
During the breeding season, female white-footed and deer mice come into heat every fifth day until impregnated. The gestation period is usually 21 to 23 days, but may be as long as 37 days in nursing females. Young are weaned when they are 2 to 3 weeks old and become sexually mature at about 7 to 8 weeks of age.dentification. Fifteen species of native mice of the genus Peromyscus may be found in the United States. The two most common and widely distributed species are the deer mouse (Peromyscus maniculatus, Fig. 1) and the white-footed mouse (P. leucopus). This chapter will deal primarily with these species.