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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 .
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]
The Danish Landrace, Danish: Hvid Dansk Landrace, is a Danish breed of pig. It is of medium to large size, white in colour with a long body, fine hair, a long snout, and heavy drooping ears. It is of medium to large size, white in colour with a long body, fine hair, a long snout, and heavy drooping ears.
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 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]
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 American Landrace is a long, lean, white pig with 16 or 17 ribs. The head is long and narrow, the ears are large and heavy and hang forward close to the snout. The back is only slightly arched or is nearly flat. The side is even and well-fleshed and the ham is plump but not over-fat.
As the figure shows, each time that the mouse with the desired trait (in this case the lack of a gene (i.e. a knockout), indicated by the presence of a positive selectable marker) is crossed with a mouse of a constant genetic background, the average percentage of the genetic material of the offspring that is derived from that constant ...