Numbers of duplicated and deleted CNV loci in the 11 chicken breeds, classified according length. The lengths of the CNV loci were classified as <5 kb, 5–10 kb, 10–20 kb, or >20 kb (indicated in blue, red, green, and purple, respectively). The upper panel displayed data for duplications, and the lower panel displayed data for deletions. The x-axis displayed the identities of the breed females (F) and males (M). For the duplicated CNV loci, the 10–20 kb- and >20 kb-length groups constituted 86% of the total. For the deleted CNV loci, the 10–20 kb- and >20 kb-length groups constituted 83% of the total.