Efficiency of genomic selection in a composite line from inbred crosses for a trait with heritability of 0.1 using a low density marker maps was evaluated. Cumulative responses (CR) and cumulative discounted responses (CDR, 10% interest) over 10 generations, starting from the F2, to selection on the sum of estimates of marker interval effects fitted either as fixed (Fix-MAS) or random (Ran-MAS) across the genome were compared with standard BLUP selection. Results were based on 100 replicates. Both MAS strategies outperformed BLUP selection for both CR and CDR. Ran-MAS had greater CR than Fix-MAS in early generations and similar CR later. When phenotypes were available only in the F2 for MAS, Fix-MAS led to considerable lower CDR than BLUP and Ran-MAS to similar CDR to BLUP. In conclusion, genomic selection can be effective in composite lines using a sparse marker map.

N. Piyasatian, Rohan L Fernando, Jack CM Dekkers

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 22.65, 2006
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