Crossbreed

[1] Cats: The many newly developed and recognized breeds of domestic cat are crossbreeds between existing, well-established breeds (sometimes with limited hybridization with some wild species), to either combine selected traits from the foundation stock, or propagate a rare mutation without excessive inbreeding.

However, some nascent breeds such as the Aegean cat are developed entirely from a local landrace population.

Crossbreeds are popular, due to the belief that they have increased vigor without loss of attractiveness of the dog.

One type of modern crossbreeding in horses created many of the warmblood breeds used in the sport horse disciplines, usually registered in an open stud book by a studbook selection procedure that evaluates conformation, pedigree and, in some animals, a training or performance standard.

[5] One of the most ancient types of hybrid animal is the mule, a cross between a female horse and a male donkey.

Other crosses include the tigon (between a male tiger and female lion) and yakalo (between a yak and an American bison).

A mixed-breed animal is defined as having undocumented or unknown parentage, while a crossbreed generally has known, usually purebred parents of two distinct breeds or varieties.

While the term is best known when applied to certain dog crossbreeds, other animals such as cattle, horses, birds[8] and cats may also be bred in this fashion.

either form of registration may be the first step in recording and tracking pedigrees in order to develop a new breed.

[11] There are disadvantages to creating designer crossbreeds, notably the potential that the cross will be of inferior quality or that it will not produce as consistent a result as would breeding purebred animals.

[7] Also, because breeders of crossbred animals may be less careful about genetic testing and weeding out undesirable traits,[11] certain deleterious dominant genes may still be passed on to a crossbreed offspring.