2007 Paul VanRaden 1, Curt Van Tassell 2, George Wiggans 1, Tad Sonstegard 2, Bob Schnabel 3, Jerry Taylor 3, and Flavio Schenkel 4, Paul VanRaden 1, Curt.

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Presentation transcript:

2007 Paul VanRaden 1, Curt Van Tassell 2, George Wiggans 1, Tad Sonstegard 2, Bob Schnabel 3, Jerry Taylor 3, and Flavio Schenkel 4, Paul VanRaden 1, Curt Van Tassell 2, George Wiggans 1, Tad Sonstegard 2, Bob Schnabel 3, Jerry Taylor 3, and Flavio Schenkel 4, USDA 1 Animal Improvement Programs and 2 Bovine Functional Genomics Labs, Beltsville, MD, USA, 3 U. Missouri, Columbia, and 4 U. Guelph, ON, Canada 2008 Genomic Data and Cooperation Result in Faster Progress

Interbull / ICAR, June 2008 (2) Paul VanRaden 2008 Experimental Design  Predict April 2008 daughter deviations from August 2003 PTAs Similar to Interbull trend test older Holstein bulls 1759 younger bulls (total = 5335)  Genomic predictions computed for 27 traits: 5 yield, 5 health, 16 conformation, and Net Merit

Interbull / ICAR, June 2008 (3) Paul VanRaden 2008 Genotyped Animals (n=6005) As of April 2008

Interbull / ICAR, June 2008 (4) Paul VanRaden 2008 Genomic Data and Methods  38,416 markers for each bull  Direct genomic evaluation Inversion for linear prediction, REL Iteration for nonlinear prediction  Combined genomic evaluation 3 x 3 selection index combining direct genomic PTA, traditional PA or PTA, and subset PA or PTA by REL

Interbull / ICAR, June 2008 (5) Paul VanRaden 2008 R-square values and Reliabilities comparing traditional to genomic predictions Squared corr (x100) Reliability TraditionalGenomic Trait PAGenomicPARealizedGain Net Merit Milk Fat Protein Fat % Protein %

Interbull / ICAR, June 2008 (6) Paul VanRaden 2008 R-square values and Reliabilities comparing traditional to genomic predictions Squared corr (x100) Reliability TraditionalGenomic Trait PAGenomicPARealizedGain Longevity SCS Fertility S.calf ease D.calf ease Final score

Interbull / ICAR, June 2008 (7) Paul VanRaden 2008 Value of Genotyping More SNP 9,604 (10K), 19,208 (20K), and 38,416 (40K) SNP R 2 of PA Genomic R 2 Trait10K20K40K Net Merit $ Milk yield Fat yield Protein yield Longevity SCS Fertility

Interbull / ICAR, June 2008 (8) Paul VanRaden 2008 Value of Genotyping More Bulls BullsR 2 for Net Merit PredictorPredicteePAGenomicGain

Interbull / ICAR, June 2008 (9) Paul VanRaden 2008 Expected vs Observed Reliability  Reliability for predictee bulls Traditional PA: 27% average across traits Genomic: 63% expected vs. 50% observed Observed range 78% (fat pct) to 31% (SCE) PTA regressions.8 to.9 of expected  REL and PTA adjustments Multiply genomic daughter equivalents by.7 to make expected closer to observed For example, 16 *.7 = 11 Include polygenic effect, less than 5%

Interbull / ICAR, June 2008 (10) Paul VanRaden 2008 Simulated Results World Bull Population  15,197 older and 5,987 younger bulls from all countries in Interbull file  40,000 SNP and 10,000 QTL (heavy tail)  Provided timing, memory test  Reliability vs parent average REL REL = corr 2 (EBV, true BV) 80% vs 34% expected for young bulls 72% vs 30% observed in simulation

Interbull / ICAR, June 2008 (11) Paul VanRaden 2008 Genetic Progress  Assume 60% REL for net merit Sires mostly 2 instead of 6 years old Dams of sons mostly heifers with 60% REL instead of cows with phenotype and genotype (66% REL)  Progress could increase by >50% 0.37 vs genetic SD per year Reduce generation interval more than accuracy

Interbull / ICAR, June 2008 (12) Paul VanRaden 2008 Conclusions  Genomic predictions significantly better than parent average (P <.0001) for all 27 traits tested  Gains in reliability equivalent on average to 11 daughters with records Analysis used 3576 historical bulls April data included 5285 proven bulls  R 2 increases with more bulls and SNPs

Interbull / ICAR, June 2008 (13) Paul VanRaden 2008 Acknowledgments  Funding: National Research Initiative grants CDDR Contributors (NAAB, Semex)  Genotyping and DNA extraction: BFGL, U. Missouri, U. Alberta, GeneSeek, GIFV, and Illumina  Computing from AIPL staff