Genomic DNA and total RNA were extracted from the mandibular lymph nodes using the AllPrep DNA/RNA/Protein Mini Kit (QUIAGEN) and following the manufacture’s recommendations. RNA was stored at −80 °C until subsequent mRNA expression analysis. Individuals were genotyped using the Illumina porcine SNP60 BeadChips71 (link), from which 61565 SNPs were obtained. The average genotyping rate was 0.92, varying across individuals from 0.50 to 0.99.
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