ISSN 2398-2977      

Locoweed (Astragalus - Oxytropis spp)

pequis

Synonym(s): White pointed locoweed, crazy weed, milk vetches


Introduction

  • Relatively few species of the large genus of Astragalusand Oxytropisare collectively referred to as locoweeds because of their neurotoxic effects on hoses and other animals.
  • Species most commonly associated wtih locoism include Astrangalus lentigenosisA. mollissimusand Oxytropis sericea.
  • Locoweeds are perennial or annual herbaceious plants native to North America prefering open areas and foothills in well drained soils, especially of the intermountain areas of the Rocky Mountain.
  • Leaves generally pinnately compound, with 1-20 leaflets, a terminal leaflet being present   Locoweed (Astragalus / Oxytropis spp) 01  .
  • Flowers may be white or reddish-purple, depending on the species and are produced on leafless stalks   Locoweed (Astragalus / Oxytropis spp) 02  .
  • All parts of the plant are toxic to all animals that eat it.
  • Poisonous at all times, even when dried.
  • No treatment available.
  • Palatable to horses, especially when in flower, therefore ensure removal of the plant from pastures or remove the horse to 'safe pasture' that is free of locoweed.

Toxicity

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Clinical signs

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Diagnosis

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Treatment

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Prognosis

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Stegelmeier B L, James L F, Panter K E & Molyneux R J (1995) Serum swainsonine concentration and alpha-mannosidase activity in cattle and sheep ingesting Oxytropis sericeaand Astragalus lentiginosus (locoweeds). Am J Vet Res 56, 149-154 PubMed.
  • Kirkpatrick J G & Burrows G E (1990) Locoism in horses. Vet Hum Toxicol 32, 168-169 PubMed.
  • James L F & Van Kampen K R (1971) Acute and residual lesions of locoweed poisoning in cattle and horses.  JAVMA 158, 614-618 PubMed.

Other sources of information

  • Knight A & Hall J (2004) The 10 Most Dangerous Plants for Horses. Equus 320, 71-81.
  • Knight A P & Walter R G (2001) A guide to plant poisoning of animals in North America. Teton New Media, Jackson, Wyoming.
  • Burrows G E & Tyrl R J (2001) Toxic Plants of North America. Iowa State University Press, Iowa.
  • Allison K (1999) A Guide to Plants Poisonous to Horses. J A Allen & Co Ltd. ISBN: 0851316980.
  • Cooper M R & Johnson A W (1998) Poisonous Plants and Fungi - An Illustrated Guide. The Stationery Office. ISBN: 0112429815.
  • Allison K & Day C (1997) A Guide to Plants Poisonous to Horses. British Association of Holistic Nutrition and Medicine.

Organization(s)

  • Cornell University - Poisonous Plants Informational Database. Website: www.ansci.cornell.edu/plants.
  • ToxicologyOnline.com. Website: www.toxonline.com.
  • Guide to Poisonous Plants. Website: www.southcampus.colostate.edu/poisonous_plants
  • Veterinary Poisons Information Service (VPIS), London Center, Medical Toxicology Unit, Avonley Road, London SE14 5ER, UK. Tel: +44 (0)20 7635 9195; Fax: +44 (0)20 7771 5309.
  • Veterinary Poisons Information Service (VPIS), Leeds Center, The General Infirmary, Great George Street, Leeds LS1 3EX, UK. Tel: +44 (0)113 245 0530; Fax: +44 (0)113 244 5849.

Related Images

Can’t find what you’re looking for?

We have an ever growing content library on Vetlexicon so if you ever find we haven't covered something that you need please fill in the form below and let us know!