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LABORATORY ANIMAL SCIENCE EXAM 2025/2026 BANK QUESTIONS AND
ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS AND
STUDY GUIDE / EXPERT VERIFIED FOR GUARANTEED PASS/ALREADY GRADED
A+
How do we sex rats? - ANSWER-By the anogenital distance,
males are 1 1/2 times longer than that of females
What type of ovulator is a rat? - ANSWER-Spontaneous
Are Rats covered by the AWA (Animal Welfare Act)? - ANSWER-
No
What is the common name for Chromdacryorrhea? What gland
produces the chemical that causes this condition? What is the
name of the chemical? When might you see this condition? -
ANSWER-Chromodacryorrhea is an abnormally or excessive
amount of red tear production.
The red tears are colored by porphyrin which is created in the
harderian gland.
Chromodacryorrhea is usually seen when an animal is stressed or
ill.
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Steps to Gavaging - ANSWER-1. Measure from the diastema to
the most caudal rib
2. Enter through the diastema from the side
3. Straighten the needle out so it is parallel with the head
4. Advance the needle back over the tongue
5. Tip the syringe back so animal's head is tipped back
6. Allow the needle to slide in
7. Deliver
8. Gently remove needle and give the animal a break
What are the reasons medications are delivered by gavaging? -
ANSWER-We deliver medication, food or fluids via gavage when
an animal is not eating due to illness or trauma. We also deliver
testing material via gavage in the laboratory setting; specifically to
rats because they cannot vomit.
What are some problems that can occur when oral gavage is
administered improperly? - ANSWER-If there is too much force
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exerted when completing a gavage the esophagus can be
punctured or the needle can be accidentally placed in the trachea.
If the liquid is delivered prior to being fully placed, the animal can
aspirate the fluid.
You are breeding a Brother-Sister mating of 2 B6D2F2 mice. The
male is brown and the female is tan.
What are the correct Genotype possibilities, (future offspring) for
these two mice? - ANSWER-Male's genotype(s): bbDd, bbDD
Female's genotype(s): bbdd
How do we sex guinea pigs? - ANSWER-By examining the
genitalia
Guinea Pig Scientific Name - ANSWER-Cavia Porcellus
Guinea Pig Dental Formula - ANSWER-2(I1/1, C0/0, P1/1, M3/3)
What teeth in the guinea pig are open rooted? - ANSWER-All of
the teeth
LABORATORY ANIMAL SCIENCE EXAM 2025/2026 BANK QUESTIONS AND
ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS AND
STUDY GUIDE / EXPERT VERIFIED FOR GUARANTEED PASS/ALREADY GRADED
A+
How do we sex rats? - ANSWER-By the anogenital distance,
males are 1 1/2 times longer than that of females
What type of ovulator is a rat? - ANSWER-Spontaneous
Are Rats covered by the AWA (Animal Welfare Act)? - ANSWER-
No
What is the common name for Chromdacryorrhea? What gland
produces the chemical that causes this condition? What is the
name of the chemical? When might you see this condition? -
ANSWER-Chromodacryorrhea is an abnormally or excessive
amount of red tear production.
The red tears are colored by porphyrin which is created in the
harderian gland.
Chromodacryorrhea is usually seen when an animal is stressed or
ill.
,2|Page
Steps to Gavaging - ANSWER-1. Measure from the diastema to
the most caudal rib
2. Enter through the diastema from the side
3. Straighten the needle out so it is parallel with the head
4. Advance the needle back over the tongue
5. Tip the syringe back so animal's head is tipped back
6. Allow the needle to slide in
7. Deliver
8. Gently remove needle and give the animal a break
What are the reasons medications are delivered by gavaging? -
ANSWER-We deliver medication, food or fluids via gavage when
an animal is not eating due to illness or trauma. We also deliver
testing material via gavage in the laboratory setting; specifically to
rats because they cannot vomit.
What are some problems that can occur when oral gavage is
administered improperly? - ANSWER-If there is too much force
, 3|Page
exerted when completing a gavage the esophagus can be
punctured or the needle can be accidentally placed in the trachea.
If the liquid is delivered prior to being fully placed, the animal can
aspirate the fluid.
You are breeding a Brother-Sister mating of 2 B6D2F2 mice. The
male is brown and the female is tan.
What are the correct Genotype possibilities, (future offspring) for
these two mice? - ANSWER-Male's genotype(s): bbDd, bbDD
Female's genotype(s): bbdd
How do we sex guinea pigs? - ANSWER-By examining the
genitalia
Guinea Pig Scientific Name - ANSWER-Cavia Porcellus
Guinea Pig Dental Formula - ANSWER-2(I1/1, C0/0, P1/1, M3/3)
What teeth in the guinea pig are open rooted? - ANSWER-All of
the teeth
