Tail samples were sent to the University of North Carolina, where genomic DNA was extracted using a Qiagen Gentra Pure tissue kit according to the manufacturer's protocols. All genome-wide genotyping was performed using the GigaMUGA array at the University of North Carolina (GeneSeek, Lincoln, NE) [56 (link)]. Genotypes were called using Illumina BeadStudio (Illumina, Carlsbad, CA) and processed with argyle [57 (link)].
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