The median-joining network based on 951 bp of the mitochondrial D-Loop representing 272 horses within 87 haplotypes. Mutational hot spots were taking into account according to Cieslak et al.  and Jansen et al. . The haplogroups were named as defined by Achilli et al.  and mentioned as letters next to each haplogroup. Each strain was shown by color and the proportions of different strains for each haplotype were shown. Strain abbreviations are found in Table 2. Samples with unknown strain were represented by black. Reference sample X79547 was labeled with a star.