There are several different genetic technologies that have been used to improve trait performance for pig farmers. Some examples would include:a) Terminal Cross Mating System: this is simply using a crossbred female composed of breeds that are best for reproduction as the maternal line animals. The most common examples are the use of a Landrace/Large White Fl female as the parent female. This allows the best breeds for reproduction to exert their strengths, and takes advantage of the heterosis that is expressed by the Fl female for reproductive traits.b) Optimal Genetic System Structure: this is where the production farm uses the proper number of GGP, GP and Parent Stock females in the genetic system. Usually at least 10% of the female herd should be in the GGP and GP roles. These maternal females then are mated to a breed or line of terminal boar that best fit the needs of the producer. The most common terminal breeds are the Duroc, Pietrain, or composite terminal lines. This allows for the producer to take advantage of both maternal heterosis in the females, and heterosis for terminal traits in the market hogs.
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