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Originally, the Duroc was a very large pig, but not as large as was the Jersey Red. Today, it is a medium-sized breed with a moderately long body and a slightly dished face. The ears are drooping and not held erect. The color is often an orangish-brown, but ranges from a light-golden shade to a deep mahogany-red. [1]
Duroc boars are bred with Large White Italiana or Italian Landrace sows, or more frequently with hybrid sows from those two breeds. The pigs are usually farmed intensively and are slaughtered at a weight of 160–170 kg ; the meat is almost all used to make preserved meat products such as Parma ham and prosciutto di San Daniele .
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The original breed by this name was the Danish Landrace pig, from which the others were derived through development and crossbreeding. The breed was so named because the foundation stock of the Danish Landrace were specimens from the local, free-breeding, non- pedigreed stock of swine, i.e., the regional landrace native to Denmark.
The word landrace entered non-academic English in the early 1930s, by way of the Danish Landrace pig, a particular breed of lop-eared swine. [14] Many other languages do not use separate terms, like landrace and breed, but instead rely on extended description to convey such distinctions. Spanish is one such language.
The British Landrace is a British domestic breed of pig and one of the most popular in the United Kingdom. [1] It is pink with heavy drooping ears that cover most of the face and is bred for pork and bacon. [2] The breed originated in the 1949 importation of 12 landrace pigs from Scandinavia — four boars and eight gilts (immature females). [1]
Backcrossed hybrids are sometimes described with acronym "BC"; for example, an F1 hybrid crossed with one of its parents (or a genetically similar individual) can be termed a BC1 hybrid, and a further cross of the BC1 hybrid to the same parent (or a genetically similar individual) produces a BC2 hybrid.
Though not as popular as the Duroc, Yorkshire, or Hampshire, [8] the Chester White is actively used in commercial crossbreeding operations for pork. [6] The Chester White is the most durable of the white breeds; it can gain as much as 1.36 pounds (0.62 kg) a day and gain 1 pound (0.45 kg) for every 3 pounds (1.4 kg) of grain it is fed.