A stochastic simulation was used to compare genetic and inbreeding responses for different genetic evaluation-selection systems, viz; selection 1) at random , 2) on true breeding value (TB V ), 3) on phenotype, 4) on BLUP estimated breeding value (EBV) and 5) on BLUP EBVH , using a false high heritability estimate. An algorithm to adjust the EBV of a selection candidate for the average relationship with those already selected was also used. The relation of the genetic response to inbreeding response at generation 10 is show n graphically for a range in the number of sires used. Comparisons show a gradual increase in the inbreeding (for the same number of sires) from random selection, selection on T B V , on phenotype, on EBVH and to the highest level with EBV, from co-selection of relatives. W hen the number of sires is fixed (and small--less than 20), it is possible to get substantial reductions in inbreeding for small reductions in response using EBVH, compared with selection on EBV. However, similar results can be obtained simply by increasing the number of sires used. Put in this graphical form for comparison, only modest gains in genetic response at the same level of inbreeding w ere obtained by the alternative evaluation-selection system s, and no single system seems generally optimum.

M. Quinton, C. Smith

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 147–150, 1994
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