Pyrrolizidine Alkaloidosis Toxic Plants Quiz
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Questions and Answers

Which animals are most susceptible to pyrrolizidine alkaloidosis?

  • Young growing animals
  • Cattle and horses
  • Farmed deer and pigs (correct)
  • Sheep and goats
  • What is the most common cause of pyrrolizidine alkaloidosis in animals?

  • Seeds of yellow tarweed (A intermedia)
  • Groundsel (S riddellii, S longilobus)
  • Rattleweed (Crotalaria retusa)
  • Senecio jacobaea (correct)
  • Under what conditions might grazing animals eat plants containing pyrrolizidine alkaloids?

  • During extremely lush pasture conditions
  • When the plants are avoided under normal conditions
  • During drought conditions (correct)
  • When the plants are available as roughage
  • What is the most common manifestation of pyrrolizidine alkaloidosis in domestic animal species?

    <p>Chronic hepatic damage</p> Signup and view all the answers

    How do pyrrolizidine alkaloids primarily produce cytotoxic effects on target sites?

    <p>By binding to DNA and nucleoproteins</p> Signup and view all the answers

    What may be the underlying cause of ongoing hepatic damage in cases of chronic exposure to pyrrolizidine alkaloids?

    <p>The release and uptake of toxic pyrroles by neighboring cells</p> Signup and view all the answers

    What are some common clinical signs in horses and cattle exposed to pyrrolizidine alkaloids?

    <p>Anorexia and dullness</p> Signup and view all the answers

    In chronic cases of pyrrolizidine toxicoses, how is the liver typically described?

    <p>Atrophied, fibrous, and finely nodular</p> Signup and view all the answers

    What is a characteristic histopathologic change that may occur in the liver due to pyrrolizidine alkaloidosis?

    <p>Perivenous fibrosis of sublobular veins</p> Signup and view all the answers

    What is the mechanism of action of pyrrolizidine alkaloids after they are metabolized in the liver?

    <p>Crosslinking DNA strands and uniting with nucleoproteins</p> Signup and view all the answers

    What may lead to sudden death in animals affected by acute intoxication from pyrrolizidine alkaloids?

    <p>Visceral hemorrhages</p> Signup and view all the answers

    What clinical signs may be observed in horses affected by pyrrolizidine toxicoses?

    <p>&quot;Head-pressing, yawning, aimless wandering&quot; and anorexia</p> Signup and view all the answers

    What are some less common clinical signs associated with pyrrolizidine toxicoses?

    <p>Renal disease in pigs and inspiratory dyspnea in ponies due to laryngeal paralysis</p> Signup and view all the answers

    What is a potential outcome of chronic exposure to small doses of pyrrolizidine alkaloids?

    <p>Development of hepatic neoplasms</p> Signup and view all the answers

    What can be a result of excessive hepatic copper stores in sheep exposed to pyrrolizidine alkaloids?

    <p>Rectal prolapse and ascites</p> Signup and view all the answers

    Which microscopic change is described as variable in livers affected by pyrrolizidine alkaloidosis?

    <p>Bile duct hyperplasia</p> Signup and view all the answers

    What pulmonary changes may occur in horses exposed to certain Crotalaria spp?

    <p>Septal fibrosis and bronchioloalveolar epithelium hyperplasia</p> Signup and view all the answers

    What is the method used for chemical analysis of whole blood to confirm recent exposure to toxic metabolites?

    <p>High-performance liquid chromatography (HPLC)</p> Signup and view all the answers

    Which serum parameter may be increased in cases of hepatic cirrhosis?

    <p>Gamma-glutamyltransferase (GGT) activity</p> Signup and view all the answers

    What is the most common method used for confirming toxin exposure based on the text?

    <p>Immunoassays</p> Signup and view all the answers

    What is the characteristic histopathologic change observed in renal tissues of pigs affected by pyrrolizidine alkaloidosis?

    <p>Enlarged renal tubular lining cells</p> Signup and view all the answers

    What is the primary method used for hepatic tissue assays to provide a definitive confirmation of toxin exposure?

    <p>High-performance liquid chromatography (HPLC)</p> Signup and view all the answers

    What is a potential outcome of hepatic cirrhosis caused by pyrrolizidine alkaloidosis?

    <p>Hypoalbuminemia and hyperglobulinemia</p> Signup and view all the answers

    What is the primary form of support needed for animals affected by pyrrolizidine alkaloidosis?

    <p>Support for dehydration and photosensitization</p> Signup and view all the answers

    What may lead to further losses over several months in subclinically affected animals?

    <p>High protein intake</p> Signup and view all the answers

    What is the potential consequence of further intake of toxic plant material?

    <p>Prevention of recovery from clinical signs</p> Signup and view all the answers

    What is a recommended practice for preventing further outbreaks of pyrrolizidine alkaloidosis?

    <p>Decreasing exposure to toxic plants</p> Signup and view all the answers

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