NAVLE Bovine Herd Health Management 4

Question 1

A veterinarian is performing a herd reproductive evaluation. Which metric best represents overall reproductive efficiency in a beef cow-calf operation?

Accepted Answer

Percentage of cows pregnant by 90 days post-calving (21-day pregnancy rate)

Answer

The percentage of cows pregnant by 90 days post-calving (equivalent to a 90-day breeding season) measures overall reproductive efficiency by accounting for both conception rate and submission rate.

Question 2

Foot rot (Fusobacterium necrophorum infection) is common in beef feedlots. Which environmental management change has the greatest impact on reducing foot rot incidence?

Accepted Answer

Reducing mud and standing water in pen areas to minimize skin maceration

Answer

Wet, muddy conditions cause skin maceration between the claws, allowing Fusobacterium necrophorum to invade; pen drainage and mud management are the most impactful environmental interventions.

Question 3

A dairy herd has a high prevalence of digital dermatitis (Mortellaro's disease). Which treatment is most effective for active, painful lesions?

Accepted Answer

Topical oxytetracycline applied to the lesion and wrapped with a bandage

Answer

Topical oxytetracycline or lincomycin applied directly to digital dermatitis lesions after cleaning and drying, covered with a bandage, achieves the highest cure rates for active M2 lesions.

Question 4

When designing a biosecurity protocol for a cow-calf operation, which practice is MOST important for preventing introduction of Bovine Leukemia Virus (BLV)?

Accepted Answer

Testing all purchased cattle for BLV antibodies before introduction and segregating positives

Answer

BLV is most effectively prevented by serological testing (AGID or ELISA) of all purchased cattle and excluding seropositive animals, since there is no approved vaccine in the US.

Question 5

A beef producer asks about strategies to reduce the use of medically important antimicrobials in the feedlot. Which intervention is the best alternative for reducing bovine respiratory disease (BRD) morbidity?

Accepted Answer

Implementing metaphylaxis only for high-risk cattle combined with optimization of vaccination protocols

Answer

Targeted metaphylaxis in high-risk cattle combined with robust vaccination programs reduces BRD morbidity while minimizing overall antibiotic use, consistent with antimicrobial stewardship principles.

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE Bovine Herd Health Management 4