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Let's Talk Pet Foods
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Post subject: FIDDLENECK/TARWEED - AVMA WARNING- TOXIC TO HORSES  Posted: Mon Apr 28, 2008 1:06 am |
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Joined: Mon Sep 24, 2007 8:35 pm
Posts: 1033
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Veterinary group warns of weed that is toxic to horses
Saturday, April 26, 2008
The Arizona Veterinary Medical Association is alerting equine veterinarians and horse and cattle owners about a toxic weed that is highly prevalent this spring. It is commonly call fiddleneck or tarweed.
The plant affects horses and cattle when they eat it. The toxic principle is pyrrolizide alkaloids, which primarily affect the liver. As little as 15 milligrams of dried plant per kilogram of body weight over two weeks can produce liver disease. All parts of the plant are toxic, even when it is dried.
The botanical name is Amsinckia intermedia. It is a weed of dry cultivated soils/waste areas. Fiddleneck is an erect, sparsely branching annual weed about 2-3 feet tall. The entire plant is very hairy; flowers are orange to yellow in color on a distinct fiddleneck-shaped stem. The flowers only bloom on one side of the axis.
The AVMA advises horse and cattle owners to deny their animals access to this plant. The AVMA recommends clearing fence lines up to a distance of at least three feet.
Anyone wanting more information can contact the AVMMA at (602) 242-7936.
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