Incorporation of GWAS data on genomic prediction accuracies assessed in the small, unadmixed, unstructured population of Icelandic dairy cattle

TY - CONF

T1 - Incorporation of GWAS data on genomic prediction accuracies assessed in the small, unadmixed, unstructured population of Icelandic dairy cattle

AU - Gautason, Egill

N1 - Conference code: 6

PY - 2020/11

Y1 - 2020/11

N2 - Genomic estimation of breeding values has greatly increased genetic gain for major dairy cattle breeds, but has not been widely implemented in smaller populations. In small cattle populations, the implementation of genomic selection is restricted by low numbers of progeny tested reference bulls, which limits the prediction accuracy of genomically estimated breeding values (GEBVs). Methods to increase accuracy of GEBVs for small cattle populations are needed for them to remain competitive. We use genotype data from 8,100 Icelandic cattle, including cows and progeny tested bulls, to study the effect of enriching genomic prediction with GWAS results on prediction accuracies. Icelandic cattle is a dairy breed that consists of approximately 26,000 breeding females, and has an active (non-genomic) breeding program. We have genomically characterized the population, demonstrating that Icelandic cattle belongs to a clade of northern Nordic indigenous breeds and has been isolated for a long time. Admixture analysis revealed only very small traces of foreign import into the population, and the population is unstructured.

AB - Genomic estimation of breeding values has greatly increased genetic gain for major dairy cattle breeds, but has not been widely implemented in smaller populations. In small cattle populations, the implementation of genomic selection is restricted by low numbers of progeny tested reference bulls, which limits the prediction accuracy of genomically estimated breeding values (GEBVs). Methods to increase accuracy of GEBVs for small cattle populations are needed for them to remain competitive. We use genotype data from 8,100 Icelandic cattle, including cows and progeny tested bulls, to study the effect of enriching genomic prediction with GWAS results on prediction accuracies. Icelandic cattle is a dairy breed that consists of approximately 26,000 breeding females, and has an active (non-genomic) breeding program. We have genomically characterized the population, demonstrating that Icelandic cattle belongs to a clade of northern Nordic indigenous breeds and has been isolated for a long time. Admixture analysis revealed only very small traces of foreign import into the population, and the population is unstructured.

M3 - Poster

T2 - 6th International Conference of Quantitative Genetics

Y2 - 2 November 2020 through 12 November 2020

ER -