Strains or families are frequently used terms for grouping certain horses according to their various Bedouin breeders. In the desert when individual horses distinguished themselves in battle or performed exceptional feats of speed, courage or endurance, strains or families were developed from them. Certain tribes would focus on their influence, line breeding and inbreeding to them producing special characteristics unique to their family which was given a strain name, such as Kuhaylan, Abayyan, Hamdani, Dahman, etc. The strain name was handed down from the tail female line according to Bedouin custom as they rode only mares in warfare. Great sires were prized for the strain or tail female line that they represented. Although strain names are passed on through the tail female line, care must be given to place certain emphasis on the entire pedigree (all the strains represented) as well as that of the tail female line in order to correctly perceive an individual or plan a breeding. To better understand some of the distinctive features of the various strain types let us look at the Bedouin strains represented in the breeding program of Desert Bred Arabian Stud.