The mean sum of Run of Homozygosity (ROH) per HD genotyped animal. The sum of ROH was calculated per animal, measured in megabases (Mb) within each ROH length category and averaged per breed. Breeds from left to right are Angus, Belgian Blue, Charolais, Friesian, Hereford, Holstein, Holstein-Friesian, Limousin and Simmental. Angus and Hereford had high amount of mean short ROH (<5 Mb) possibly due to ancestral relatedness whereas the Holsteins had the greater mean long ROH (>20 Mb) due to recent consanguineous matings.
Purfield et al. BMC Genetics 2012 13:70 doi:10.1186/1471-2156-13-70