1


2

 Squared correlation of PTA with true breeding value
 Increases with amount of relevant information
 Initially derived from the inverse of coefficient matrix
 Approximation needed as number of genotyped animals got large

3

 Initial approximation assumed all animals received the same amount of
information from genomics
 Genomic relationship of each animal
with the predictor animals routinely calculated
 These relationships weighted by reliability and summed now are basis for
calculating contribution of genomics to Reliability

4


5


6


7


8

 Calculating Genomic Matrix may be too time consuming with many 3K
genotypes
 May sum the allele content of predictor population
 Reliability then based on sum of reliabilities of trad PTA and fraction
of alleles in common with predictor population

9

 Contribution of genomics to reliability calculated individually
 Based on relationship to predictor population and their Rel of Trad PTA
 Mode Rel is 7475 for bulls without a trad evaluation
