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The article discusses the chronic poisoning by hepatotoxic Senecio spp. plants of sheep herds in Rio Grande do Sul, Brazil. It is noted that sheep grazing is practiced to control overgrowth of the weeds in consideration of their level of tolerance to pyrrolizidine alkaloid poisoning. Clinical signs in sheep and cattle include weight loss, apathy and photosensitization. Among the necropsy findings are hydropericardium, seneciosis and hepatic encephalopathy.

The article presents a study on breakout of seneciosis in cattle with high prevalence of photosensitization. It further mentions several symptoms including weight loss, excessive lacrimation and nasal serous discharge. It also mentions that liver biopsy was performed on several cattle which found hard liver, distended gall bladder and abomasum.