Fatal yew (Taxus sp) poisoning in Willamette Valley, Oregon, horses.

Veterinary and human toxicology Pub Date : 2004-10-01
R B Cope, C Camp, C V Lohr
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Abstract

Despite the well-founded reputation of plants of the genus Taxus as being amongst the most toxic plants for domestic livestock in the US, there are surprisingly few published case reports of yew poisoning in horses. This report documents 2 acute fatalities in horses in the central Willamette Valley, OR associated with the consumption of Taxus sp. The predominant features of the intoxication were peracute death, with no signs of struggling or convulsions, in otherwise fit and well managed adult horses. The most significant gross necropsy findings were limited to pulmonary congestion and hemorrhage, suggestive of acute circulatory disturbance. A diagnosis of Taxus sp poisoning was confirmed on the basis of a history of potential exposure, by the identification of yew leaves in the gastric contents of the horses, and by the subsequent identification of yew clippings in the pasture. The literature relevant to Taxus sp poisoning in horses is reviewed.

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致命的紫杉(Taxus sp)中毒在威拉米特山谷,俄勒冈州,马。
尽管红豆杉属植物在美国被认为是对家畜毒性最大的植物之一,但令人惊讶的是,很少有关于红豆杉中毒马的报道。本报告记录了在俄亥俄州威拉米特山谷中部发生的2例与红豆杉中毒有关的马的急性死亡。在健康和管理良好的成年马中,中毒的主要特征是超急性死亡,没有挣扎或抽搐的迹象。最重要的大体尸检结果仅限于肺充血和出血,提示急性循环障碍。根据潜在暴露史,通过在马胃内容物中鉴定红豆杉叶,以及随后在牧场中鉴定红豆杉剪枝,确定了红豆杉中毒的诊断。本文综述了有关马红豆杉中毒的文献。
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