Fig. 2

Phylogenetic relationship and population structure of QCB pigs and other six breeds tested in this study. (A) Neighbor-joining phylogenetic tree constructed from SNP data among seven populations. (B) PCA plot of population structure showing the top two principal components. (C) ADMIXTURE analysis with seven populations (K = 2-3). (D) Represents the linkage disequilibrium decay plot for nine pig breeds. Asian domestic (AD), Asian wild (AW), Guanzhong black (GZB), European domestic (ED), European wild (EW), Large white (LW), and Qinchuan black (QCB)