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ALAT > Ch18 - Mice > Flashcards

Ch18 - Mice Flashcards

1
Q

What is the most common form of enrichment for mice?

A

Group housing

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2
Q

What is the term used when a mouse (or any animal) chews the hair off its cagemates?

A

Barbering

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3
Q

In addition to having no hair, what is another characteristic of nude mice?

A

They have a deficiency in their immune system.

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4
Q

If a mouse’s dorsal pelvic bones are readily palpable, and the segmentation of its vertebral column is evident, it would be considered _______________, with a body condition score of _____.

A

Under-conditioned; BCS = 2

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5
Q

What stocking density (number of animals per cage) for mice is indicated by the Guide?

A

4-5

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6
Q

How long is the gestation period in non-lactating female mice?

A

19-21 days

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7
Q

How long after mating can mucous plugs remain in the rodent’s vagina?

A

24 hours

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8
Q

What is the average weight of a newborn mouse?

A

1 - 1.5 grams

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9
Q

How often do female mice go into estrus?

A

Every 4-5 days

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10
Q

What is “tunnel handling”?

A

Letting a mouse enter an enclosed tube and moving the tube between cages

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11
Q

What is one advantage to feeding mice pelleted feed?

A

Mice gnaw the pellets, which helps to wear down their incisors (preventing malocculsion)

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12
Q

What is the scientific name for the common laboratory mouse?

A

Mus musculus

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13
Q

true or false: Removing the dominant mouse will stop mice from fighting their cage mates

A

False

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14
Q

When is toe clipping usually done?

A

With neonates, with IACUC approval (not a recommended ID method)

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15
Q

What does the designation “F1” mean for a hybrid strain?

A

It’s the first generation of the mating scheme

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16
Q

What are three factors that influence the level of aggression shown by mice?

A

Territoriality, social dominance, and strain

17
Q

True or False: outbred mice are created by mating a closed population (animals at least 4 generations) of unrelated animals.

A

True

18
Q

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

A

True

19
Q

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

A

False (heart rate and resp. rate are too fast to observe visually)

20
Q

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

A

True

21
Q

True or False: Inbred strains usually have larger litters than outbred stocks

A

False (smaller litters)

22
Q

True or False: By 7 days of age, mouse pups are fully furred and their eyes are open

A

False (occurs ~10-14 days)

23
Q

What are hybrid mice?

A

The offspring of two different strains of mice

24
Q

True or False: Female mice exposed to constant light may stop having an estrous cycle

A

True

25
Q

List 5 signs of pain, distress or illness in mice.

A
  1. ruffled fur
  2. dehydration
  3. hunched posture
  4. inactive
  5. weight loss
26
Q

Skin tenting and sunken eyes are signs of what health problem?

A

Dehydration

27
Q

Newborn mice are ___________, meaning that they are born hairless and helpless, with eyes and ear canals closed

A

Altricial

28
Q

What is the term for coming into heat 24 hours after giving birth? (time period varies between species)

A

postpartum estrus

29
Q

How much does an adult male mouse weigh?

A

20-40 grams

30
Q

How much does an adult female mouse weigh?

A

18-35 grams

31
Q

What is the average life span of a mouse?

A

12 - 36 months

32
Q

Female mice come into heat within ___ hours of parturition

A

14 - 28 hours

33
Q

How many pups are generally in a mouse litter?

A

4 - 12 mice

34
Q

At what age (days) are mice pups weaned?

A

21-28 days

35
Q

Disturbing litters after birth can lead to ________.

A

Cannibalism

36
Q

Failure to wean litters on time can lead to ________.

A

Overcrowding

37
Q

Females reach puberty/estrus around ______ weeks, but they typically don’t start breeding until ____ days.

A

4 - 5 weeks; 50 days

38
Q

Low humidity in an animal room can cause what disease in mice?

A

Ringtail

ALAT (34 decks)

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