Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Comparison of genome-wide association and genomic prediction methods for milk production traits in Korean Holstein cattle

  • Lee, SeokHyun (Animal Breeding and Genetics Division, National Institute of Animal Science, RDA) ;
  • Dang, ChangGwon (Animal Breeding and Genetics Division, National Institute of Animal Science, RDA) ;
  • Choy, YunHo (Animal Breeding and Genetics Division, National Institute of Animal Science, RDA) ;
  • Do, ChangHee (Division of Animal and Dairy Science, Chungnam National University) ;
  • Cho, Kwanghyun (Department of Dairy Science, Korea National College of Agriculture and Fisheries) ;
  • Kim, Jongjoo (Division of Applied Life Science, Yeungnam University) ;
  • Kim, Yousam (Division of Applied Life Science, Yeungnam University) ;
  • Lee, Jungjae (Jun P&C Institute, INC.)
  • Received : 2018.11.12
  • Accepted : 2019.01.11
  • Published : 2019.07.01
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Abstract

Objective: The objectives of this study were to compare identified informative regions through two genome-wide association study (GWAS) approaches and determine the accuracy and bias of the direct genomic value (DGV) for milk production traits in Korean Holstein cattle, using two genomic prediction approaches: single-step genomic best linear unbiased prediction (ss-GBLUP) and Bayesian Bayes-B. Methods: Records on production traits such as adjusted 305-day milk (MY305), fat (FY305), and protein (PY305) yields were collected from 265,271 first parity cows. After quality control, 50,765 single-nucleotide polymorphic genotypes were available for analysis. In GWAS for ss-GBLUP (ssGWAS) and Bayes-B (BayesGWAS), the proportion of genetic variance for each 1-Mb genomic window was calculated and used to identify informative genomic regions. Accuracy of the DGV was estimated by a five-fold cross-validation with random clustering. As a measure of accuracy for DGV, we also assessed the correlation between DGV and deregressed-estimated breeding value (DEBV). The bias of DGV for each method was obtained by determining regression coefficients. Results: A total of nine and five significant windows (1 Mb) were identified for MY305 using ssGWAS and BayesGWAS, respectively. Using ssGWAS and BayesGWAS, we also detected multiple significant regions for FY305 (12 and 7) and PY305 (14 and 2), respectively. Both single-step DGV and Bayes DGV also showed somewhat moderate accuracy ranges for MY305 (0.32 to 0.34), FY305 (0.37 to 0.39), and PY305 (0.35 to 0.36) traits, respectively. The mean biases of DGVs determined using the single-step and Bayesian methods were $1.50{\pm}0.21$ and $1.18{\pm}0.26$ for MY305, $1.75{\pm}0.33$ and $1.14{\pm}0.20$ for FY305, and $1.59{\pm}0.20$ and $1.14{\pm}0.15$ for PY305, respectively. Conclusion: From the bias perspective, we believe that genomic selection based on the application of Bayesian approaches would be more suitable than application of ss-GBLUP in Korean Holstein populations.

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