Merck Manual

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Selected Physiologic Data of Laboratory Animals a

Selected Physiologic Data of Laboratory Animals a

Species

Gestation Period (days)

Litter Size

Age and Body Weight at Sexual Maturity

Usual Life Span (yr)

Average Body Temperature (°C)

Heart Rate (bpm)

Water Consumption (per day)b

Mice

19–21

6–10

6 wk (20–30 g)

1–3

37

310–840

4–7 mL

Rats

21–23

6–14

2−3 mo (0.2–0.3 kg)

2–3

37.5

300–500

30 mL

Guinea pigs

59–72

1–4

3–4 mo (0.4–0.5 kg)

3–4

38

230–380

150 mL

Hamsters, golden

15–18

4–10

2 mo (85–110 g)

2–3

37

280–410

30 mL

Gerbils

25

2–9

3 mo (60–100 g)

3–4

39

250–360

4 mL

Rabbits

30−33

4–12

5–6 mo (3–4 kg)

5–7

39

200–300

300–700 mL

Squirrel monkeys

150

1

3–5 yr (0.6–1.1 kg)

16–20

39

300–380c

70–110 mL

Rhesus monkeys

164

1–2

3–4 yr (5–11 kg)

15–30

38

120–180c

0.2–1 L

Chimpanzees

227–235

1

7–10 yr (40–50 kg)

20–30 (males), 30–40 (females)

37

60–120c

2.2–2.7 L

Baboons

164–186

1

4−7 yr (11–30 kg)

30–40

39

95–145c

1–1.5 L

bTypical of an average adult; varies with body mass index, number of animals per cage, moisture in feed, temperature, etc.

c Results obtained under anesthesia.