NAVLE ACTUAL EXAM QUESTIONS AND ANSWERS 2025/2026 |
COMPLETE QUESTIONS AND CORRECT ANSWERS | UPDATED
VERSION
What nerve(s) need to be blocked in order to dehorn cattle? - (Correct Answer) -
Cornual
What nerve(s) need to be blocked in order to dehorn goats? - (Correct Answer) -
cornual nerve and infratrochlear nerve
Several rabbits in a commercial meat operation have developed genital scabs, perineal
ulcerations a crusty exudate around the nose and eyes. Microhemaglutination tests are
positive for treponematosis.
Which one of the following steps is most effective to treat this problem?
A - Amprolium-medicated feed for whole herd, 2 weeks; Increase ventilation
B - Clindamycin PO for exposed rabbits, 8 days; Cull affected animals
C - Amipcillin PO for affected rabbits, 10-14 days
D - Isolate affected animals, Lincomycin in water 2-3 weeks
E - Penicillin IM for all rabbits, 5-7 days - (Correct Answer) -Penicillin IM for all
rabbits, 5-7 days
Two bucket-fed veal calves are depressed and stunted and have sticky feces coating
their hindquarters. Fluid-splashing sounds are audible during auscultation over the left
flank when a calf is drinking.
Passage of a stomach tube obtains a rancid-smelling liquid with a pH of 5.2 [N=5.9-
6.2]
,Which one of the following choices is the most appropriate treatment?
A - Cull affected calves
B - Remove fermented rumen contents, flush with saline
C - Wean affected calves; Shift to bottle-feeding for well calves
D - Vitamin E/Selenium injections, plus dietary supplements
E - Inoculate rumen fluid from a healthy cow into calf by stomach tube - (Correct
Answer) -B - Remove fermented rumen contents, flush with saline
This is the clinical picture of a ruminal drinker calf with chronic indigestion from milk
deposited directly into the rumen.
Treat by removing the fermented material and flushing the rumen with saline.
Attempt to induce gastric/reticular groove closure during feeding by inducing
vigorous sucking activity with a finger before feeding milk. If calves relapse, consider
weaning.
The problem occurs due to failure of the gastric groove reflex, which normally shunts
milk directly into the abomasum, (bypassing the rumen). Most often seen in bucket
fed calves who gulp their milk.
Abortions due to brucellosis tend to occur at what stage of pregnancy? - (Correct
Answer) -D - Last half of pregnancy
Typically, Brucellosis causes abortion in the LAST HALF of pregnancy, for the 5th
month onwards. Last trimester is also a good answer, though not entirely correct. You
might remember "Bruce is always late".
,Expect STILLBORN calves. Cows only abort ONCE.
Brucellosis is REPORTABLE.
The vaccines used are the Brucella abortus strain 19 vaccine or the RB51 vaccine,
given to heifer calves 4-12 months old, along with a USDA tattoo in the right ear.
Remember: "The right ear is the RIGHT EAR".
BVD and Trichomoniasis (occasionally) can cause early abortion in cows, but MOST
things cause abortion late, like 3rd trimester.
Listeriosis and Arcanobacterium pyogenes can cause abortion at any time during
pregnancy.
A cow is presented on emergency with urea/non-protein nitrogen toxicity.
What is the treatment of choice?
A - Atropine, Protopam chloride IV q 4-6 hours
B - Rumenal infusion 2-8 liters vinegar,3-10 gallons cold water
C - Rumenotomy
D - IV Fluids with MgSO4, Na thiosulfate PO
E - Relieve bloat, drench with 2-8 liters sodium bicarbonate - (Correct Answer) -B -
Rumenal infusion 2-8 liters vinegar,3-10 gallons cold water
, A 3-month old calf is presented for necropsy. The calf collapsed and suddenly died
this morning after she escaped and was chased around the back pasture for 45
minutes by her owner.
Among other things, endocardial plaques in the left ventricle of this calf's heart are
discovered.
What advice should be given the farmer?
A - Treat the other calves with vitamin E/Selenium
B - Check the mother for bovine leukosis by AGID
C - Take all the calves off ionophore-containing feed
D - Start the other calves on Ceftiofur (Naxcel ®)
E - Search the calf barn for sources of lead - (Correct Answer) -A - Treat the other
calves with vitamin E/Selenium
Treat the other calves with vitamin E/Selenium. Think White Muscle Disease when
you see SUDDEN DEATH and endocardial PLAQUES in a young calf, lamb or kid
with a history of recent VIGOROUS EXERCISE. Follow this link to a Merck image
of pale ventricular myocardium.
Typically seen in young, fast-growing animals (ie: calves 2 weeks-6 mos) Clinical signs
may include dyspnea (due to myocardial disease), stiff gait, arched back, weakness,
recumbent but BAR (bright, alert, responsive).
Sudden death may resemble enterotoxemia, should see acute bloody diarrhea,
convulsions, opisthotonos in first days of life with enterotoxemia.
COMPLETE QUESTIONS AND CORRECT ANSWERS | UPDATED
VERSION
What nerve(s) need to be blocked in order to dehorn cattle? - (Correct Answer) -
Cornual
What nerve(s) need to be blocked in order to dehorn goats? - (Correct Answer) -
cornual nerve and infratrochlear nerve
Several rabbits in a commercial meat operation have developed genital scabs, perineal
ulcerations a crusty exudate around the nose and eyes. Microhemaglutination tests are
positive for treponematosis.
Which one of the following steps is most effective to treat this problem?
A - Amprolium-medicated feed for whole herd, 2 weeks; Increase ventilation
B - Clindamycin PO for exposed rabbits, 8 days; Cull affected animals
C - Amipcillin PO for affected rabbits, 10-14 days
D - Isolate affected animals, Lincomycin in water 2-3 weeks
E - Penicillin IM for all rabbits, 5-7 days - (Correct Answer) -Penicillin IM for all
rabbits, 5-7 days
Two bucket-fed veal calves are depressed and stunted and have sticky feces coating
their hindquarters. Fluid-splashing sounds are audible during auscultation over the left
flank when a calf is drinking.
Passage of a stomach tube obtains a rancid-smelling liquid with a pH of 5.2 [N=5.9-
6.2]
,Which one of the following choices is the most appropriate treatment?
A - Cull affected calves
B - Remove fermented rumen contents, flush with saline
C - Wean affected calves; Shift to bottle-feeding for well calves
D - Vitamin E/Selenium injections, plus dietary supplements
E - Inoculate rumen fluid from a healthy cow into calf by stomach tube - (Correct
Answer) -B - Remove fermented rumen contents, flush with saline
This is the clinical picture of a ruminal drinker calf with chronic indigestion from milk
deposited directly into the rumen.
Treat by removing the fermented material and flushing the rumen with saline.
Attempt to induce gastric/reticular groove closure during feeding by inducing
vigorous sucking activity with a finger before feeding milk. If calves relapse, consider
weaning.
The problem occurs due to failure of the gastric groove reflex, which normally shunts
milk directly into the abomasum, (bypassing the rumen). Most often seen in bucket
fed calves who gulp their milk.
Abortions due to brucellosis tend to occur at what stage of pregnancy? - (Correct
Answer) -D - Last half of pregnancy
Typically, Brucellosis causes abortion in the LAST HALF of pregnancy, for the 5th
month onwards. Last trimester is also a good answer, though not entirely correct. You
might remember "Bruce is always late".
,Expect STILLBORN calves. Cows only abort ONCE.
Brucellosis is REPORTABLE.
The vaccines used are the Brucella abortus strain 19 vaccine or the RB51 vaccine,
given to heifer calves 4-12 months old, along with a USDA tattoo in the right ear.
Remember: "The right ear is the RIGHT EAR".
BVD and Trichomoniasis (occasionally) can cause early abortion in cows, but MOST
things cause abortion late, like 3rd trimester.
Listeriosis and Arcanobacterium pyogenes can cause abortion at any time during
pregnancy.
A cow is presented on emergency with urea/non-protein nitrogen toxicity.
What is the treatment of choice?
A - Atropine, Protopam chloride IV q 4-6 hours
B - Rumenal infusion 2-8 liters vinegar,3-10 gallons cold water
C - Rumenotomy
D - IV Fluids with MgSO4, Na thiosulfate PO
E - Relieve bloat, drench with 2-8 liters sodium bicarbonate - (Correct Answer) -B -
Rumenal infusion 2-8 liters vinegar,3-10 gallons cold water
, A 3-month old calf is presented for necropsy. The calf collapsed and suddenly died
this morning after she escaped and was chased around the back pasture for 45
minutes by her owner.
Among other things, endocardial plaques in the left ventricle of this calf's heart are
discovered.
What advice should be given the farmer?
A - Treat the other calves with vitamin E/Selenium
B - Check the mother for bovine leukosis by AGID
C - Take all the calves off ionophore-containing feed
D - Start the other calves on Ceftiofur (Naxcel ®)
E - Search the calf barn for sources of lead - (Correct Answer) -A - Treat the other
calves with vitamin E/Selenium
Treat the other calves with vitamin E/Selenium. Think White Muscle Disease when
you see SUDDEN DEATH and endocardial PLAQUES in a young calf, lamb or kid
with a history of recent VIGOROUS EXERCISE. Follow this link to a Merck image
of pale ventricular myocardium.
Typically seen in young, fast-growing animals (ie: calves 2 weeks-6 mos) Clinical signs
may include dyspnea (due to myocardial disease), stiff gait, arched back, weakness,
recumbent but BAR (bright, alert, responsive).
Sudden death may resemble enterotoxemia, should see acute bloody diarrhea,
convulsions, opisthotonos in first days of life with enterotoxemia.
