Cattle bracken poisoning

Evans, W.C., T. Korn, S. Natori, K. Yoshihira, and M. Fukuoka Chemical and Toxicological Studies on Bracken Fern, Pteridium aquilinum var. latiusculum. VIII. The Inability of Bracken Extracts Containing Pterosins to cause Cattle Bracken Poisoning. J. Pharm. Dyn. 6, 938 (1983). 

Many grazing cattle have long been known to die from eating poisonous plants such as bracken fern and others. In 1978, a disease with jaundice, colic, and photophobia as the main symptoms broke out among cattle in Hokkaido, the northern island of Japan. It was demonstrated by Sonoda et al. to be plant poisoning caused by Daphniphyllum humile Maxim. (Ezo-Yuzuriha) (6), from which some new alkaloids were isolated in addition to several known ones. Pharmacological properties are also described briefly in Section III. 

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