PCA of worldwide cattle breeds excluding Chinese ones. We calculated PCs from 394 present-day cattle individuals, including both taurine and indicine cattle but excluding Chinese breeds for a clearer separation within the taurine cattle. Each present-day cattle individual is marked by a 3-letter code representing its breed name. Ancient cattle and aurochs individuals are projected onto the top 2 PCs and marked by color-filled symbols. The proportion of variance explained by each PC is indicated in the axis labels.