Crossbreeding can be used in beef cattle production to provide for heterosis and to use breed differences in additive genetic merit for specific characters to more effectively synchronize performance characteristics and general adaptability of genetic resources with climatic environment, nutritive environment and other resources that are most economical to provide, consistent with market requirements. Thirdly, complementarity can be exploited in part of self-contained herds through use of terminal sire breeds that have greater additive genetic merit for growth rate than associated mature weight maintained in cow herds. A fourth application is to form new composite breeds from a multibreed foundation to provide an alternative, or, a supplement to continuous crossbreeding systems to use heterosis and to optimize additive genetic composition. Thus, crossbreeding systems can provide a means to use both nonadditive (heterosis) and additive (breed differences) effects of genes simultaneously (Gregory and Cundiff, 1980)
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 482–503, 1982
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