Aplastic anemia in cattle is caused by which toxin source?

Aplastic anemia in cattle is caused by which toxin source?

• A. Bracken Fern Toxicity (Pteridium Sp.)
• B. Copper Deficiency
• C. Iron Overload
• D. Moldy Sweet Clover

Answer: (A)

In cattle, aplastic anemia is driven by a toxin that suppresses the bone marrow, leading to pancytopenia. Bracken fern (Pteridium species) contains compounds, notably ptaquiloside, that damage hematopoietic tissue in the bone marrow. When cattle graze or ingest large amounts of bracken, the bone marrow becomes hypocellular and fails to produce adequate red cells, white cells, and platelets. This produces weakness, pale mucous membranes, infections, and bleeding tendencies due to the loss of multiple blood cell lines. Moldy sweet clover causes coagulopathy from dicoumarol, while copper deficiency or iron overload affect different pathways, not marrow suppression, so they don’t produce true aplastic anemia. The key idea is that bracken fern toxicity directly disrupts bone marrow function to cause aplastic anemia.

In cattle, aplastic anemia is driven by a toxin that suppresses the bone marrow, leading to pancytopenia. Bracken fern (Pteridium species) contains compounds, notably ptaquiloside, that damage hematopoietic tissue in the bone marrow. When cattle graze or ingest large amounts of bracken, the bone marrow becomes hypocellular and fails to produce adequate red cells, white cells, and platelets. This produces weakness, pale mucous membranes, infections, and bleeding tendencies due to the loss of multiple blood cell lines. Moldy sweet clover causes coagulopathy from dicoumarol, while copper deficiency or iron overload affect different pathways, not marrow suppression, so they don’t produce true aplastic anemia. The key idea is that bracken fern toxicity directly disrupts bone marrow function to cause aplastic anemia.