Merck Manual

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Biologic Data of Pet Rodents

Biologic Data of Pet Rodents

Chinchilla

Gerbil

Guinea Pig

Hamster

Mouse

Life spana (yr)

4–15

2.5–4

4–8

1–2

1–2

Adult male body wt (g)

400–500

45–130

800–1,600

85–140

20–30

Adult female body wt (g)

400–600

55–135

700–1,300

95–120

18–35

Sexual maturity (wk)

32–36

9–12

10–12

4–7

6–8

Gestation (days)

111

24–26

63–69

16

19–21

Litter size (average)

2

1–12

3–4

6–10

5–12

Weaning (days)

42–56b

21

30b

21–30

21–23

a Life span data is for typical lifespan range in pet rodents. Life spans exceeding these times have been recorded for rodents in research studies.

b Guinea pigs and chinchillas have precocious young that can eat some solid food at 7–14 days. Early weaning results in lower body wt and social maladaptation in later life.