Chaoter 18: Mice

Question 1

Which of the following is NOT an acceptable method for picking up a mouse?
A- grasp the tail near the bae, using your thumb and forefinger
B- grasp the mouse by the skin on the back of the neck using a smooth-tipped forceps
C- grasp the tip of the tail, using your thumb and forefinger

Answer 1

C- grasp the tip of the tail, using your thumb and forefinger

Question 2

True or False
Mice less than 10 days of age may be caught by cupping the hands around the whole body or by picking up a group of pups together with a small amount of nesting material.

Answer 2

True

Question 3

True or False

Both respiration and heart rate in the mouse are easily measured by observing or feeling the chest

Answer 3

False

Too fast to visualize

Question 4

True or False

When a behaviorally dominant mouse chews fur off a more subordinate mouse, the behavioral condition is called trimming

Answer 4

False

Barbering

Question 5

An acceptable management technique that may reduce or prevent fighting among male mice housed together is to house young males together from weaning

Answer 5

True

Question 6

True or False

The “F1” on the end of a hybrid designation indicated that this is the second generation

Answer 6

False

It is the 1st generation

Question 7

True or False

Inbred strains usually have larger litters than outbred stocks

Answer 7

False

Inbred usually have smaller litters

Question 8

True or False

By 7 days of age, mouse pups are fully furred and their eyes are open

Answer 8

False

Eyes open 10-14 days

Question 9

What are hybrid mice?

Answer 9

The offspring of two different strains of mice

Question 10

What is the term for the condition that results when the incisors become overly long and do not align properly?

Answer 10

Malocclusion

Question 11

What is the term for the space between the anus and genital papilla of most rodents?

Answer 11

Anogenital distance

Question 12

How often do female mice come into estrus?

Answer 12

Once every 4 to 5 days

Question 13

Weight of an adult male mouse (grams)

Answer 13

20-40 grams

Question 14

Weight of a newborn mouse (grams)

Answer 14

1 - 1.5 grams

Question 15

Average lifespan of a mouse in months

Answer 15

12-36 months

Question 16

Longer anogenital distance in mice

Answer 16

Male

Question 17

Shorter anogenital distance in mice

Answer 17

Female

Question 18

Female mice come into heat within ______ hours of parturition

Answer 18

14-28 hours

Question 19

A common sign that a mouse is sick

Answer 19

Ruffled fur

Question 20

Gestation period for mice in days

Answer 20

19-21

Question 21

Litter size in mice

Answer 21

4-12

Question 22

Weaning age for mice in days

Answer 22

21-28 days

Question 23

Disturbing mice litters after birth can lead to this

Answer 23

Overcrowding

Question 24

This strain typically has smaller litters

Answer 24

Inbred strains

Question 25

This strain of mice typically has larger litters

Answer 25

Outbred strains

Question 26

Female mice start breeding at this age in days

Answer 26

50

Question 27

What is a sign that neonatal mice are nursing well?

Answer 27

A white spot on the left side of the abdomen

Question 28

Which of the following is a very common method of euthanizing mice? A- decapitation B- CO2 asphyxiation C- captive bolt D- cardiac injection of potassium chloride

Answer 28

B- CO2 asphyxiation

Question 29

Mice are most active at night. What is the term used to describe being active at night?

Answer 29

Nocturnal

Question 30

What is the scientific name of the common house mouse?

Answer 30

Mus musculus

Question 31

What is the most common type of environmental enrichment for mice?

Answer 31

Group housing

Question 32

What is the term for coming into heat 24 hours after giving birth?

Answer 32

Postpartum estrus