Skip to Main Content
Efficiency of including first-generation information in second-generation ranking and selection: results of computer simulation.Author(s): T.Z. Ye; K.J.S. Jayawickrama; G.R. Johnson
Source: Tree Genetics and Genomes. 3: 319-328
Publication Series: Scientific Journal (JRNL)
PDF: Download Publication (524 KB)
DescriptionUsing computer simulation, we evaluated the impact of using first-generation information to increase selection efficiency in a second-generation breeding program. Selection efficiency was compared in terms of increase in rank correlation between estimated and true breeding values (i.e., ranking accuracy), reduction in coefficient of variation of correlation coefficients (i.e., ranking reliability), and increase in realized gain, with best linear unbiased prediction (BLUP). The test populations were generated with varying parameters: selection strategy (forward vs. backward selection of parents); number of parents (24 to 96); number of crosses per parent (1 to 8); heritability (0.05 to 0.35); ratio of dominance to additive variance (0 to 3); ratio of additive-by-site to additive variance (0 to 3); and ratio of dominance-by-site to additive variance (0 to 3). The two selection strategies gave distinct results. When parents of the second-generation crosses had been selected via backward selection, adding first-generation information markedly increased selection efficiency. Conversely, when parents had been selected via forward selection, first-generation information provided little increase in efficiency. The amount of increase depended more on heritabilities in both generations and less on dominance and genotype-by-environment effects. Including first-generation information helped more when there were many parents and few crosses per parent in the second generation. Only in the case of extremely low first-generation heritabilities was there no benefit to adding first-generation information in terms of improved ranking reliability and accuracy.
- Visit PNW's Publication Request Page to request a hard copy of this publication.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationYe, T.Z.; Jayawickrama, K.J.S.; Johnson, G.R. 2006. Efficiency of including first-generation information in second-generation ranking and selection: results of computer simulation. Tree Genetics and Genomes. 3: 319-328
KeywordsStochastic simulation, selection efficiency, BLUP, first-generation information, second-generation selection
- Parental GCA testing: how many crosses per parent?
- Genetic Variance in the F2 Generation of Divergently Selected Parents
- Mating design considerations—How many crosses do we really need to test?
XML: View XML