Purebred 825332 223814473 2008-07-05T23:07:20Z Lightbot 7178666 Units/dates/other '''Purebreds''', also called ''purebreeds'', are cultivated varieties or ''cultivars'' of an animal [[species]], achieved through the process of [[selective breeding]]. When the [[pedigree chart|lineage]] of a purebred animal is recorded, that animal is said to be '''pedigreed'''. The term ''purebred'' is occasionally confused with the proper noun ''[[Thoroughbred]],'' which refers exclusively to a specific [[list of horse breeds|breed]] of [[horse]], one of the first breeds for which a written national [[breed registry|stud book]] was created <!-- a purebred animal that has had meticulously documented pedigrees and a [[closed stud book]] -->since the 18th century. Thus a purebred animal should never be called a "thoroughbred" unless the animal actually is a registered Thoroughbred horse. ==True breeding== In the world of [[selective breeding|animal breeding]], to "breed true" means that specimens of an animal [[breed]] will breed true-to-type when mated like-to like; that is, that the progeny of any two individuals in the same breed will show consistent, replicable and predictable characteristics. A puppy from two purebred dogs of the same breed, for example, will exhibit the traits of its parents, and not the traits of all breeds in the subject breed's ancestry. However, over time, there are also concerns that breeding from too small a gene pool can lead to [[inbreeding]] and the development of negative characteristics or even a collapse of a breed population due to [[inbreeding depression]]. Hence, there is continuing tension within many purebred animal breeds over the question of when a breed may need to allow "outside" blood in for the purpose of improving the overall health and vigor of an animal breed. ==Pedigrees== A '''pedigreed [[animal]]''' is one that has its ancestry recorded. Often this is tracked by a major [[breed registry|registry]]. The number of generations required varies from breed to breed, but all pedigreed animals have papers from the registering body that attest to their ancestry. The word "pedigree" appeared in the English language in 1410 as "pee de Grewe", "pedegrewe" or "pedegru", each of those words being borrowed to the Middle French "pié de grue", meaning "crane foot". This comes from a visual analogy between the trace of the bird's foot and the three lines used in the English official registers to show the ramifications of a genealogical tree <ref>History of dog pedigree in Europe http://www.braquedubourbonnais.info/en/pedigree.htm</ref>. Sometimes the word ''purebred'' is used synonymously with ''pedigreed,'' but purebred refers to the animal having a known ancestry, and pedigree refers to the written record of breeding. Not all purebred animals have their lineage in written form. For example, until the 20th century, the [[Bedouin]] people of the [[Arabian peninsula]] only recorded the ancestry of their [[Arabian horse]]s via an [[oral tradition]], supported by the swearing of religiously-based oaths as to the [[asil]] or "pure" breeding of the animal. Conversely, some animals may have a recorded pedigree or even a registry, but not be considered "purebred." Today the modern [[Anglo-Arabian]] horse, a cross of [[Thoroughbred]] and [[Arabian horse|Arabian]] bloodlines, is considered such a case. == Purebreds by animal == ===Purebred dogs=== {{main|Purebred (dog)}} A ''purebred dog'' is a dog of a [[Dog breed|modern breed of dog]], with written documentation showing the individual purebred dog's descent from its breed's [[foundation bloodstock|foundation stock]]. In dogs, the term breed is used two ways: loosely, to refer to [[dog type]]s or [[landrace]]s of dog (also called natural breeds or ancient breeds); or more precisely, to refer to modern breeds of dog, which are documented so as to be known to be descended from specific ancestors, that closely resemble others of their breed in appearance, movement, way of working and other characters; and that reproduce with offspring closely resembling each other and their parents.<ref name="definition">{{cite book |others= The Merriam-Webster Editorial Staff |title= Webster's Third New International Dictionary of the English Language, Unabridged |origdate= 1967 |publisher= G&C Merriam Company |location= Springfield, MA U.S.A. |language= English |pages= 274 |quote= A breed is a group of domestic animals related through common ancestors and '''visiblily similar in most characteristics''', having been differentiated from others by human influence; a distinctive group of domesticated animals differentiated from the wild type under the influence of man, the sum of the progeny of a '''known and designated foundation stock''' without admixture of other blood.}}</ref> Purebred dogs are breeds in the second sense. New breeds of dog are constantly being created, and there are many websites for new breed associations and breed clubs offering legitimate registrations for new or rare breeds. When dogs of a new breed are "visiblily similar in most characteristics" and have reliable documented descent from a "known and designated foundation stock"<ref name="definition" /> they can then be considered members of a breed, and, if an individual dog is documented and registered, it can be called ''purebred''. ===Purebred horses=== According to the "Four Foundations" theory, the [[evolution of the horse]] ultimately produced [[horse]]s of four basic body types, adapted to different environments. Beginning with the may have been bred true to original type by humans, though emphasizing certain inherent traits (such as a good temperament, suitable to training by humans) to a greater degree than others. In other cases, horses of different body types were [[crossbreeding|cross bred]] until a desired characteristic was achieved and bred true. Written and oral histories of various animals or pedigrees of certain types of horses have been kept throughout history, though [[breed registry]] stud books trace only to about the 13th century, at least in [[Europe]], when pedigrees were tracked in writing, and the practice of declaring a type of horse to be a breed or a purebred became more widespread. Certain [[List of horse breeds|horse breeds]], such as the [[Andalusian horse]] and the [[Arabian horse]], are claimed by aficionados of the respective breeds to be ancient, near-pure descendants from one or the other of the original four wild prototypes, though absent a full mapping of the horse genome and other [[DNA]] research, such claims are difficult to prove or disprove. ===Purebred cats=== A cat whose [[genealogy|ancestry]] is formally registered is called a [[Purebred cat|''purebred'' cat]], or a ''pedigreed'' cat. A ''purebred'' cat is one whose ancestry contains only individuals of the same breed. A ''pedigreed'' cat is one whose ancestry is recorded, but may have ancestors of different breeds. The [[list of cat breeds]] is quite large: most cat registries actually recognize between 30 and 40 breeds of cats, and several more are in development, with one or more new breeds being recognized each year on average, having distinct features and heritage. Owners and breeders compete in cat shows to see whose animal bears the closest resemblance to the "ideal" definition, based on [[breed type]] and the [[breed standard]] for each breed.<ref>[http://www.nevaclub.pl/EN/index.php?id=publication05 The contemporary history of breeding Siberians]</ref> Because of common crossbreeding in populated areas, many cats are simply identified as belonging to the homogeneous breeds of [[domestic longhair cat|domestic longhair]] and [[domestic shorthair cat|domestic shorthair]], depending on their type of fur. Some original cat breeds that have a distinct phenotype that is the main type occurring naturally as the dominant domesticated cat type in their region of origin are sometimes considered as subspecies and in the past received names as such, although this is no longer supported by feline biologists.<ref>[http://www.iczn.org/BZNMar2003opinions.htm#opinion2027 ''Felis silvestris catus''] with ''F. silvestris'' the wild cat and ''F. s. catus'' the domestic.</ref> Some of these cat breeds (with their invalid scientific names for historical interest) are: *''F. catus anura'' - the Manx *''F. catus siamensis'' - the Siamese *''F. catus cartusenensis'' - the Chartreux *''F. catus angorensis'' - the Turkish Angora ===Purebred livestock=== Most domesticated [[farm]] animals also have true-breeding breeds and [[breed registry|breed registries]], particularly [[cattle]], [[sheep]], [[goat]]s, [[rabbit]]s, and [[pig]]s. While animals bred strictly for market sale are not always purebreds, or if purebred may not be registered, most livestock producers value the presence of purebred genetic stock for the consistency of traits such animals provide. It is common for a farm's male breeding stock in particular to be of purebred, pedigreed lines. == Wild species, Landraces, and Purebred species == {{seealso|Genetic pollution|Landrace}} {{Unreferenced|date=September 2007}} Breeders of purebred [[domesticated]] species discourage [[crossbreeding]] with wild species, unless a deliberate decision is made to incorporate a trait of a wild ancestor back into a given breed or strain. Wild populations of animals and plants have evolved naturally over millions of years through a process of [[Natural selection]] in contrast to human controlled [[Selective breeding]] or [[Artificial selection]] for desirable traits from the human point of view. Normally, these two methods of reproduction operate independently of one another. However, an intermediate form of selective breeding, wherein animals or plants are bred by humans, but with an eye to adaptation to natural region-specific conditions and an acceptance of natural selection to weed out undesirable traits, created many ancient domesticated breeds or types now known as [[landrace]]s. Many times, [[domesticated]] species live in or near areas which also still hold naturally evolved, region-specific [[wild]] ancestor species and subspecies. In some cases, a domesticated species of plant or animal may become [[feral]], living wild. Other times, a wild species will come into an area inhabited by a domesticated species. Some of these situations lead to the creation of [[hybridized]] plants or animals, a cross between the native species and a domesticated one. This type of crossbreeding, termed [[genetic pollution]] by those who are concerned about preserving the genetic base of the wild species, has become a major concern. Hybridization is also a concern to the breeders of purebred species as well, particularly if the gene pool is small and if such crossbreeding or hybridization threatens the genetic base of the domesticated purebred population. The concern with genetic pollution of a wild population is that hybridized animals and plants may not be as genetically strong as naturally evolved region specific wild ancestors [[wildlife]] which can survive without human [[animal husbandry|husbandry]] and have high immunity to natural diseases. The concern of purebred breeders with wildlife hybridizing a domesticated species is that it can coarsen or degrade the specific qualities of a breed developed for a specific purpose, sometimes over many generations. Thus, both purebred breeders and wildlife biologists share a common interest in preventing accidental hybridization. == See also == *[[Breed]] (includes lists of animal breeds) *[[Breed registry]] *[[Cat breed]] *[[Open stud book]] *[[Closed stud book]] *[[Consanguinity]] *[[Crossbreeding]] *[[Dog breed]] *[[Dog breeding]] *[[Dog hybrids and crossbreeds]] *[[Endogamy]] *[[Horse breeding]] *[[Inbreeding]] *[[Mixed-breed dog]] *[[Purebred (dog)]] ==References== {{reflist}} [[Category:Breeding]] [[Category:Dog breeds|* P]] [[Category:Dog breeding]] [[Category:Dog types|*]] [[Category:Cat fancy]] [[Category:Types of horses]] [[Category:Horse breeds]] [[Category:Livestock]] [[es:Pedigrí]] [[fr:Pedigree]] [[ja:ペディグリー]] [[pt:Pedigree]] [[zh:純種犬]]