Dairy
Authors: Melanie K. Hayr (Iowa State University) , Xiaochen Sun (Iowa State University) , Tom Druet (University of Liège) , Dorian J. Garrick (Iowa State University)
Performance of genomic prediction from haplotype models utilizing fixed length haplotype blocks ranging from 125 kb – 2 Mb and haplotype allele frequency cutoffs ranging from 1-10% were compared to a model using SNP genotypes. Milk fat yield deviations and genotypes at 37,740 SNPs were from 38,385 Holstein Friesian, Jersey and KiwiCross cows (Training=23,907; Validation=14,478) from New Zealand. This study showed slight improvement in accuracy and bias of genomic prediction when using 125 kb haplotype blocks with a 1% filter; however this was associated with a large increase in run-time. Haplotype blocks larger than 1 Mb are not appropriate for genomic prediction in this population.
Keywords:
How to Cite: Hayr, M. K. , Sun, X. , Druet, T. & Garrick, D. J. (2016) “Genomic Prediction of Milk Fat using Fixed Length Haplotypes”, Iowa State University Animal Industry Report. 13(1). doi: https://doi.org/10.31274/ans_air-180814-201