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When finishing breeding or finishing crossing are sires of a race whose performance in one or more characteristics of the well above the level to be refined race, used limited, that is: There is a metered importation of genes one or more other populations into their own ( see also immigration ). The aim is to maintain the positive properties of the existing population and to integrate the desired higher “performance” of the foreign population. This enables faster breeding progress to be achieved.

This breeding method is used, for example, in warm blood breeding by crossing thoroughbreds .