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Improved reliability of genomic evaluations

Improved reliability of genomic evaluations. What is reliability. 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.

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Improved reliability of genomic evaluations

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  1. Improved reliability of genomic evaluations

  2. What is reliability • 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. Change implemented in April • 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. 4000 3500 3000 2500 Number of Bulls 2000 1500 1000 500 0 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 Milk REL Reliability for young HO Bulls N = 15,226

  5. Reliabilities for HO born ≥ 2005

  6. Bulls First Traditional Eval. Jan., 2010

  7. Cows First Traditional Eval. Jan., 2010

  8. Adapting to more genotypes • 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. Conclusions • Contribution of genomics to reliability calculated individually • Based on relationship to predictor population and their Rel of Trad PTA • Mode Rel is 74-75 for bulls without a trad evaluation

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