The number of pastures and their relative sizes can have a major influence on which crossbreeding systems are feasible. Some very effective crossbreeding systems, such as multibreed composites, can be conducted in a single breeding pasture. These systems allow relatively efficient use of heterosis, but do not allow as much opportunity to exploit breed differences as when multiple breeding pastures are available. In most cases, using a terminal sire breed will require one breeding pasture that is larger than the rest (or a group of breeding pastures that can be used similarly). If artificial insemination is an option, then the number of pastures available for use during the breeding season is less important.
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