Cattle given intraruminal administration of 4-ipomeanol, a furanoterpenoid originally obtained from sweet potatoes infected with Fusarium solani (F. javanicum), developed a respiratory syndrome clinically and histologically indistinguishable from atypical interstitial pneumonia. There were edema and emphysema in the lungs and mediastinum. The maximum nonlethal oral dose of 4-ipomeanol was estimated to be between 7.5 and 9 mg/kg of body weight.
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