Equis ISSN 2398-2977


Contributor(s): Bob Langrish, Prof Jonathon Naylor


  • Warmblood.


  • Quarterhorse   Quarterhorse  .

General information

  • Originally from the USA.
  • One of the USA's oldest and most popular breeds.
  • Has the largest stud book in the world with 2.7 million registered.
  • The name originates from the quarter-mile race the horse excels in.
  • This form of racing is very popular in the USA.
  • A consistent, versatile horse.
  • Intelligent.
  • Great balance and agility.


Principal uses

  • Riding.
  • Ranchwork.
  • Rodeo.
  • Racing.
  • Showing.


  • Registered.

Biologic Data

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Further Reading


Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Church S (1995) Hyperkalemic periodic paralysis in Australian Quarterhorses. Aust Vet J 72, 314-316.
  • Naylor J M, Robinson J A & Bertone J (1992) Familial incidence of hyperkalemic periodic paralysis in Quarterhorses. JAVMA 3, 340-343.

Other sources of information

  • American Quarterhorse Association (1996) Hyperkalemic periodic paralysis - A comprehensive brochure to inform and educate American Quarterhorse enthusiasts. AQHA, PO Box 200, Amarillo, Texas 79168, USA. Tel: +1 806 376 4811; Website: www.aqha.com.
  • Hendricks B L (1995) International Encyclopedia of Horse Breeds. University of Oklahoma Press. ISBN: 8-8061-2753-8.
  • Ball C (1994) Horse and Pony Breeds. Quintet Publishing Ltd. ISBN: 1-85076-500-6.
  • Hartley Edwards E (1994) The Encyclopedia of the Horse. Dorling, Kindersley. ISBN: 1-7513-011-59.


  • American Quarterhorse Association, PO Box 200, Amarillo, TX 79168, USA. Tel: +1 (806) 376 4811; Website: www.aqha.com.
  • British Horse Society, British Equestrian Center, Stoneleigh, Kenilworth, Warwickshire CV8 2LR, UK.