Rats & Mice (LS)

Question 1

Males are often the most aggressive sex in rodents. What is the exception?

Answer 1

Female hamsters

Question 2

Which teeth are open rooted and grow continously in rats & mice?

TQ!!!

Answer 2

Incisors

Question 3

What is a normal color of rodent teeth?

Answer 3

Orange

Question 4

Which teeth should you NOT clip in a rat/mouse?

Answer 4

Lower incisors

(should be longer than upper incisors)

Question 5

What is the most common tumor of rats & mice?

Do they frequently metastasize?

Answer 5

Mammary tumors

No!

Question 6

Do rodents vomit?

Should you fast them before SX?

TQ

Answer 6

NO & NO

Question 7

What is the Whitten Effect?

Answer 7

• when pheromones in a dominant male mouse’s urine cause a large group of female mice (housed together) to synchronize their estrus cycles

Question 8

What is the Bruce Effect?

Answer 8

refers to the tendency for female rodents to terminate their pregnancies following exposure to the scent of an unfamiliar male

Question 9

Are the inguinal rings in a male rat/mouse closed or open?

TQ

Answer 9

Open

(closed castration required)

Question 10

What is “barbering”?

Who’s doing it?

How do you TX?

Answer 10

• dominant mouse nibbles off fur & whiskers of cage mates (skin will be normal)
• Mouse that has all its fur
• Environment enrichment or remove dominant mouse

Question 11

What a good Antibiotic for mice & rats?

Answer 11

Enrofloxacin

(Baytril)

Question 12

What is the most common tumor found in mice?

Prognosis?

Answer 12

• Adenocarcinoma
• poor→ will always come back even if remove

Question 13

TX for Overgrown Incisors?

Answer 13

• Trim teeth every 2-3 mo.
• Sedate
• Use a dremel or dental drill

Question 14

C.S of Fur Mites in Mice/Rats

Answer 14

• thin, greasy hair coat
• pruritis
• self-inflicted trauma

Question 15

How are fur mites often introduced?

Answer 15

• new animals
• can be subclinical for wks - mos.

Question 16

Is a skin scrap required to DX fur mites?

Answer 16

NO!!!

Question 17

TX for Fur mites?

Answer 17

• Ivermectin
• Trim hind nails

Question 18

What causes Mouse Hepatitis Virus?

Which age group is most effected?

TQ

Answer 18

Coronavirus

(Parvo of Mice)

Neonates

Question 19

Lesion of Mouse Hepatitis Virus

Answer 19

BIG BIG liver

Question 20

Rotavirus affects what age group of mice?

How’s it different from Coronavirus?

Answer 20

• Neonates
• Soiled haircoats due to diarrhea (covered in mustard)
• Will continue to eat

Question 21

What virus is 100% fatal in mice/rat pups?

Answer 21

Sendai Virus

Question 22

C.S. of Mycoplasma pulmonis in mice/rats?

(Peterson saw rats > mice)

Answer 22

• Dyspnea
• Pneumonia
• Rhinitis
• Otitis media
• Head tilt

Question 23

Will Antibiotics eliminate Mycoplasma pulmonis infections?

Answer 23

no

Question 24

How can you TX Dermatophytosis in mice/rats?

2 causes?

Answer 24

• Topical miconazole
• Griseofulvin orally (+ corn oil)
• T. metagrophytes
• M. canis

Question 25

What is the most common tumor found in rats?

Prognosis?

Answer 25

Fibroadenoma

good →frequently benign

reoccurence is common once excise

Question 26

What can help prevent or limit the severity of Chronic Progressive Nephropathy in Rats?

Who gets it?

Answer 26

• Calorie & protein restriction
• > 1 yr old rats
• Males > females

Question 27

What causes Sialodacryoadenitis Virus in rats?

Answer 27

Coronavirus

Question 28

C.S. of Sialodacryoadenitis Virus

TX?

Answer 28

• Red ocular & nasal discharge → inflammation of Harderian gland
• Go off feed
• self-limiting (30 days)
• May require critical care for nutrition purposes

Question 29

4 agents that make up Respiratory Dz in Rats?

Answer 29

• Mycoplamsa pulmonis
• Strep. pneumoniae
• Coryne. kutscheri
• Cilia-associated Respiratory Bacillus