Genetic aspects of integrated swine crossbreeding systems are reviewed. Differences among breed crosses arise from differences in additive breed effects as well as differences in heterosis. Among systems utilizing similar amounts of heterosis, the difference between the most efficient and average crosses within a system will determine the best crossbreeding system. Breed role is only important in contributing to differences among static crosses. A better understanding and quantification of biological processes in pigs should aid in the prediction of specific cross performance and utilization of grandmaternal effects. It is always possible to increase selection response in static crosses because component breeds express maternal and direct effects in different ratios. Crossbreeding systems offer the opportunity to use single gene genotypes in various proportions. Predicted differences in specific crossbred systems are unlikely to be fully realized because parameters are estimated with error.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 45–56, 1986
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