Comparisons of crossbred selection (e.g. Reciprocal Recurrent Selection, RRS) with pure-line selection (PLS) methods were summarized in theory and experiments. Neither of the methods is an optimal selection strategy to obtain the best crosses, because PLS is better than RRS to exploit additive variance whereas RRS, which makes use of both non-additive and additive gene effects, is more efficient to exploit non-additive variance. Selection methods combining both purebred and crossbred performance are discussed. It is expected that the optimal crossbred response may be obtained by optimally weighing information from purebred and crossbred performance in a selection index to aim at the best hybrids. Some theoretical problems that have to be resolved will be addressed.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 289–292, 1990
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