STRUCTURE analysis of cattle sampled in our study.

<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018806#pone-0018806-g001" target="_blank">Figure 1a</a>: plot of <i>K</i> values against mean Ln <i>P</i>(D), error bars are ±1 standard error of the mean. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018806#pone-0018806-g001" target="_blank">Figure 1b</a>: plot of individual cluster membership coefficients defined by STRUCTURE (<i>K</i> = 3). Breed groups are delineated by vertical black lines and are identified above the figure (AA = Aberdeen Angus, HF = Holstein Friesian, HO = Holstein, HE = Hereford, BA = Blonde D'Aquitaine, BB = Belgian Blue, CH = Charolais, LIM = Limousin, SM = Simmental; in all cases a terminal ‘X’ indicates a cross-breed).