A crossbreed is an organism with purebred parents of two different breeds, varieties, or populations. Crossbreeding, sometimes called "designer crossbreeding", is the process of breeding such an organism. While crossbreeding is used to maintain health and viability of organisms, irresponsible crossbreeding can also produce organisms of inferior quality or dilute a purebred gene pool to the point of extinction of a given breed of organism.
A Cockapoo is a Poodle/Cocker Spaniel cross
An Anglo-Arabian horse is a Thoroughbred/Arabian horse cross
The National Show Horse was developed from crossbreeding programs in the 1970s and 1980s that blended Arabian horse and American Saddlebred bloodlines
A breed is a specific group of domestic animals having homogeneous appearance (phenotype), homogeneous behavior, and/or other characteristics that distinguish it from other organisms of the same species. In literature, there exist several slightly deviating definitions. Breeds are formed through genetic isolation and either natural adaptation to the environment or selective breeding, or a combination of the two. Despite the centrality of the idea of "breeds" to animal husbandry and agriculture, no single, scientifically accepted definition of the term exists. A breed is therefore not an objective or biologically verifiable classification but is instead a term of art amongst groups of breeders who share a consensus around what qualities make some members of a given species members of a nameable subset.
Braunvieh, a dairy breed with high milk production and little milk fat
Image: Vietnamese Pot Bellied Pig
Image: USDA ARS Meishan pig Cropped
Image: Pig USDA01c 0116