| 英文描述 | Prolonged ingestion of Bracken Fern (PTERIDIUM AQUILINIUM) causes a syndrome of bone marrow depression in cattle. Sheep and goats are much more resistant. Occurs sporadically where Bracken is widely available and other pasture is not. Cattle sometimes develop a taste for it. This syndrome is not due to the thiaminase present in Bracken. Signs are secondary to the bone marrow lesion, and white cells and platelets are decreased. Blood transfusions can be used for treatment. CHEILANTHES SIEBERI, known as mulga or rock fern, grows in Australia and produces a poisoning in cattle and sheep that is clinically and hematologically indistinguishable from bracken fern poisoning; in experimental poisoning animals developed signs about 3 weeks after the start of feeding trials. |
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