Genetic parameters were estimated and association analysis for tick resistance was carried out using two approaches: a genome-wide association (GWA) analysis using the GenABEL package and a regional heritability mapping (RHM) analysis. 
GenABEL
DNA was extracted from hair and blood samples and was genotyped using the Illumina BovineSNP50 assay. 
Illumina BovineSNP50 assay