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Bovine Herd Health Flashcards

7 cards from real NAVLE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Bovine Herd Health flashcards as text

  1. A herd of cattle in the Texas panhandle develops polioencephalomalacia (PEM). The most common cause in feedlot cattle on high-sulfur diets is deficiency or antagonism of which vitamin?

    Answer: Thiamine (Vitamin B1)

    High dietary sulfur promotes ruminal H2S production, which inhibits thiamine-dependent enzymes and causes cerebrocortical necrosis (polioencephalomalacia).

  2. Which program is used in the US to eradicate bovine tuberculosis caused by Mycobacterium bovis, and what is the testing method of choice for herd surveillance?

    Answer: Federal-State TB Eradication Program using the caudal fold tuberculin test (CFT)

    The US Federal-State TB Eradication Program uses the caudal fold test (CFT) for initial herd testing, with positive reactors confirmed by the comparative cervical tuberculin (CCT) test.

  3. A cow with a right-displaced abomasum (RDA) complicated by abomasal volvulus is most likely to present with which set of electrolyte and acid-base abnormalities?

    Answer: Hypokalemia, hypochloremia, metabolic alkalosis

    Abomasal outflow obstruction causes sequestration of HCl, leading to hypochloremia, hypokalemia, and a paradoxical metabolic alkalosis with paradoxical aciduria.

  4. Which biosecurity measure is most effective at preventing introduction of Johne's disease (paratuberculosis) into a closed beef herd?

    Answer: Purchasing animals from Johne's-tested herds and testing all additions

    Because no test has 100% sensitivity for Johne's disease, purchasing from certified low-prevalence herds combined with pre-purchase testing provides the best risk reduction.

  5. A beef producer has a 3% calf crop loss from scours annually. To calculate the cost of a calf scours prevention program, which parameter is NOT included in the basic cost-benefit analysis?

    Answer: Breed of the dam

    Dam breed is not a direct economic variable in a cost-benefit analysis of a vaccination program; the relevant inputs are vaccine cost, calf value, morbidity/mortality rates, and treatment costs.

  6. A beef cow herd experiences an outbreak of abortion storms affecting 30% of pregnant cows. PCR testing confirms Neospora caninum. What is the primary route of transmission in cattle?

    Answer: Transplacental (vertical) transmission from dam to fetus

    Neospora caninum is perpetuated in beef herds primarily by transplacental transmission; congenitally infected calves become the next generation of chronically infected dams.

  7. When using a whole-herd approach to control bovine respiratory disease (BRD) in a stocker operation, what does the term 'pull rate' refer to?

    Answer: Percentage of animals removed from the pen for individual treatment due to BRD signs

    Pull rate measures the proportion of cattle identified and pulled from pens for individual BRD treatment, serving as a key performance indicator of disease prevalence and health management efficacy.