Alleles at a locus in an individual can be identical by descent or be alike in state. Adding both of these for all segregating loci gives the total allelic identity for a trait. It is shown by stochastic simulation of unselected population that estimated breeding values derived using a relationship based on total allelic identity (EBVT) are more closely correlated with true breeding value (TBV) than conventional estimated breeding values (EBVR) derived using the estimated additive relationship based on pedigree. Correlations of TBV with EBVT were 0.903, 0.865 and 0.664 respectively for 5, 10 and 100 loci simulated, compared with 0.552, 0.598 and 0.609 with EBVR. With the advent of large numbers of genetic markers, and the identification of trait loci, use of total allelic identity should be considered.

A. Nejati-Javaremi, John P Gibson, 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., , 171–174, 1994
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