To detect QTLs associated with S. aureus carrier status, we genotyped all pigs using diagnostic blood samples collected in EDTA tubes (VWR, USA). DNA was extracted using either a salting out procedure with minor modifications [26 (link)] or MasterPure™ Complete DNA and RNA Purification Kit (Epicentre Biotechnologies, USA) according to the manufacturer’s instructions. The concentration and purity of DNA was measured on a NanoDrop 1000 spectrophotometer (Thermo Fisher Scientific, USA). 2500 ng of each sample was submitted for genotyping to GeneSeek, Inc. (http://www.neogeneurope.com). Samples were genotyped for 61,565 SNPs using Illumina’s Porcine SNP60 beadchip [25 (link)].
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