No information is available on the mating system of meadow jumping mice.
The breeding season of meadow jumping mice occurs shortly after hibernation in late April or May. Males emerge from hibernation slightly before females and are ready to mate when the females emerge. Within two weeks after emergence, most females are pregnant. Pregnancy usually lasts about 18 days, but may be longer for females that are nursing young. A female may have 2 to 3 litters in a year. The average litter size is 5.3, though the number of young ranges between 2 and 9. In the north, most young are born and weaned between June and August. Small and weighing about 0.8 g, the newborns are naked, pink, blind, clawless and deaf, but squeak loudly at birth. In the first week, their ears unfold, fur begins to cover their backs, and their claws appear. They begin crawling between the first and second weeks, and by the third week they can hop, creep, and hear. Their front teeth have appeared, and they have tawny coats. By the end of the fourth week, the young have adult fur, and open eyes. Weaned, they leave their mother between the 28th to 33rd day. Those young females born during the spring may reproduce after two months.
Breeding interval: Females may have 2 to 3 litters during the warm part of the year.
Breeding season: The breeding season of meadow jumping mice occurs shortly after hibernation in late April or May.
Range number of offspring: 2 to 9.
Average number of offspring: 5.6.
Average gestation period: 18 days.
Range time to independence: 28 to 33 days.
Range age at sexual or reproductive maturity (female): 2 (low) months.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); fertilization ; viviparous
Average birth mass: 0.8 g.
Average gestation period: 19 days.
Average number of offspring: 5.5.
Average age at sexual or reproductive maturity (male)
Sex: male: 61 days.
Female meadow jumping mice provide all the care for their young, until they are weaned and independent.
Parental Investment: pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female); pre-independence (Provisioning: Female, Protecting: Female)
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