Fig. 3
Distribution of ROHs across the genome and ROH profile. a The total length of homozygous segments (ROHs) detected across the genome is reported for each breed and expressed in megabases (Mb). b ROH profile given by the total number of homozygous segments and total segment size in megabases of all 37 traditional chicken breeds. In both figures, breeds were grouped according to the clusters identified in the principal component analysis, except for cluster 3, which also included the Lakenvelder and Lakenvelder bantam. Commercial lines where grouped in another cluster called Commercial white egg layers. For the North Holland blue bantam, Assendelft fowl bantam, Drenthe fowl bantam, and Schijndelaar bantam, the distribution of ROH segments across the genome is represented by a straight line, because only one individual was left after quality control. Colours and shapes were the same of Fig. 1 (cycle: large fowl; triangle: bantam counterpart; square: true bantam), except for the commercial white egg layers cluster, which were represented with a different shape
