John B. Cole Animal Genomics and Improvement Laboratory Agricultural Research Service, USDA Beltsville, MD 20705-2350 2015 What.

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Presentation transcript:

John B. Cole Animal Genomics and Improvement Laboratory Agricultural Research Service, USDA Beltsville, MD What should you expect from genomic selection?

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Introduction ● José Montero provided an excellent discussion of genomic selection in Spain ● I am going to talk more generally about how genomics works, what can reasonably be expected from genomics, and some ways of using genomics

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Overview ● How does genomic selection work? ● What can you expect from genomic selection? ● How should you use genomics?

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) How does genomic selection work?

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) How does genetic selection work? ΔG = genetic gain each year reliability = how certain we are about our estimate of an animal’s genetic merit (genomics  ) selection intensity = how selective we are when making mating decisions (management can  ) genetic variance = variation in the population due to genetics (we can’t really change this) generation interval = time between generations (genomics  )

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Genomic prediction of progeny test Select parents, transfer embryos to recipients Calves born and DNA tested Calves born from DNA- selected parents Bull receives progeny test Reduce generation interval from 5 to 2 years

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) TraitBias* Reliability (%) Reliability gain (% points) Milk (kg)− Fat (kg)− Protein (kg)− Fat (%) Protein (%) Productive life (mo)− Somatic cell score Daughter pregnancy rate (%) Sire calving ease Daughter calving ease− Sire stillbirth rate Daughter stillbirth rate Holstein prediction accuracy *2013 deregressed value – 2009 genomic evaluation

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Reliabilities for young Holsteins* *Animals with no traditional PTA in April Reliability for PTA protein (%) Number of animals 3K genotypes 50K genotypes

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Why genomics works for dairy cattle Extensive historical data available Well-developed genetic evaluation program Widespread use of AI sires Progeny-test programs High-value animals worth the cost of genotyping Long generation interval that can be reduced substantially by genomics

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) What to expect from genomic selection

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) The four-pathway model Young animals, potential parents Bulls Cows Bulls to breed bulls (5% selected) Bulls to breed cows (20% selected) Cows to breed cows (85% selected) Cows to breed bulls (2% selected) Actual parents

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Genetic gain per year in each pathway PathwaySelection (%)TraditionalGenomics Sires of bulls Sires of cows Dams of bulls Dams of cows Total Source: Schaeffer (2006)

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Parent ages of marketed Holstein bulls

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Marketed Holstein bulls Year entered AI Traditional progeny- tested Young genotypedAll bulls 20081, , , , , , , , ,931

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Genetic merit of marketed Holstein bulls Average gain: $19.77/year Average gain: $52.00/year Average gain: $85.60/year

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Genetic choices Before genomics: Proven bulls with daughter records (PTA) Young bulls with parent average (PA) After genomics: Young animals with DNA test (GPTA) Reliability of GPTA ~70% compared to PA ~35% and PTA ~85% for Holstein NM$

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Haplotypes affecting fertility Rapid discovery of new recessive defects Large numbers of genotyped animals Affordable DNA sequencing Determination of haplotype location Significant number of homozygous animals expected, but none observed Narrow suspect region with fine mapping Use sequence data to find causative mutation

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) NameChromeLocation (Mbp)Carrier FreqEarliest Known Ancestor HH Pawnee Farm Arlinda Chief HH Willowholme Mark Anthony HH Glendell Arlinda Chief, Gray View Skyliner HH Besne Buck HH Thornlea Texal Supreme JH Observer Chocolate Soldier BH West Lawn Stretch Improver BH Rancho Rustic My Design AH Selwood Betty’s Commander A partial list of fertility haplotypes For a complete list, see:

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Haplotypes to track known recessives *Causative mutation known RecessiveHaplotype Chromo- some Tested animals (no.) Concord- ance (%) New carriers (no.) BLADHHB 1*11, CVMHHC 3*13,226—2,716 DUMPSHHD 1*3, Mule footHHM15* HornedHHP1345—2,050 Red coat color HHR18*4,137—5,927 SDMBHD11* SMABHM24* WeaverBHW

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Impact on breeders Haplotype and gene tests can be used selection and mating programs A small number of elite breeders are investing heavily in genomics About 30% of young males have been genotyped directly by breeders since April 2013 Prices for top genomic heifers can be very high (e.g., €250,000)

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Impact on dairy producers General Reduced generation interval Increased rates of genetic gain Greater inbreeding/homozygosity?

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Impact on dairy producers (continued) Sires Higher average genetic merit of available bulls More rapid increase in genetic merit for all traits Larger choice of bulls in terms of traits and semen price Greater use of young bulls

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) How should you use genomic selection?

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Genotyping is very popular

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Can you afford genomic testing? Number of SNP 9K 50K 800K U.S. Price €32€92€184 Internationalprice €41 €100€192

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Four ways to use use genomics Animal ID and parentage verification Is this the animal that I think it is? Early culling decisions Am I raising the right animals? Mate selection How do I produce the best calves? Identification of elite cows

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Now we know which heifer is best The best has a PTA NM$ of +684 and a REL of 80%. The worst has a PTA NM$ of and a REL of 76%. PLANET has 4,168 genotyped daughters – which one do you want in your herd?

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Without any pedigree information, they all appear the same! Genetic Merit for NM$ 46 US Holsteins – unknown parents

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Genetic Merit for NM$ 46 US Holsteins – genotyped

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Genetic Merit for NM$ The poorest animals can be culled

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Identify your elite animals When you genotype your cows you will know which animals to contract as bull dams You will also know which embryos from a flush are the good ones and bad ones The sale of elite genetics can supplement your income from milk sales embryo_transfer_service.html

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Simulated matings Mated all genotyped Jersey bulls and cows in a fully cross-classified design bulls and cows matings Crossovers, independent assortment 100 replicates per mate pair Mean, variance, skewness, and kurtosis

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Distribution of progeny DGV Distribution of 6,000,000 randomly sampled simulated matings.

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Most extreme groups for progeny DGV

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Most extreme groups for DGV variance

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Conclusions Genomic selection provides tools for increasing rates of genetic gain Accurate genetic information is now available early in life Pedigree errors can be found and corrected Accurate culling decisions save money Better mate selection produces better heifers Elite genetics can be marketed

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Acknowledgments Dan Null, Paul VanRaden, Curt Van Tassell, and George Wiggans, AGIL Tom Lawlor, Holstein Association USA Albert de Vries, University of Florida AFRI grant , “Improving Fertility of Dairy Cattle Using Translational Genomics”

Cole XX Congreso Internacional ANEMBE de Medicina Bovina, Burgos, Spain, May 8, 2015 (‹#›) Questions?