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Locoweed Poisoning
Locoweed Poisoning in Horses
Introduction
Locoism is the term for the disease in horses and livestock caused by the ingestion of plants of the genus Astragalus and Oxytropis. Not all species are known to be toxic. Locoweeds can cause neurologic problems, reproductive dysfunction, weight loss, and habituation. Locoweeds are found from western Canada southward, to include the western United States and northern Mexico. This article discusses clinical signs, diagnosis, and treatment of locoism.
Identification
The species of Astragalus and Oxytropis that induce locoism include A. lentiginosus (36 varieties); A. mollissimus (II varieties); A. wootonii (2 varieties); A. thurberi; A. nothoxys; 0. sericea; 0. lambertii; and 0. soximontana. Additional Astragalus species incriminated in causing disease include A. argillophilus, A. bisulcatus, and A. earlei.
Clinical Signs
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