Small White pig Small White pig The Small White or Small Yorkshire was a breed of domestic pig originating in the United Kingdom and which was common during the nineteenth century. It is now extinct, but its characteristics were used in producing the Middle White and other breeds. The Small White was developed in the early nineteenth century by cross-breeding the traditional Old Yorkshire, a large white pig, with imported Chinese pigs. This created a small animal with a pure white ground colour, pricked ears, the short, wide head of the Chinese breeds and their characteristic short upturned snout. In common with the
Breed registry stud book is a stud book or breed registry that does not accept any outside blood. The registered animals and all subsequent offspring trace back to the foundation stock. This ensures that the animal is a purebred member of the breed. In horses, an example of a closed stud book is that of the Thoroughbred, with a stud book tracing to 1791. The American Kennel Club is an example of a kennel club with primarily closed books for dogs; it allows new breeds to develop under its Foundation Stock Service, but such dogs are not eligible for competition in AKC