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Strains and pedigrees

For centuries, the Bedouin tracked the ancestry of each horse through an oral tradition. Horses of the purest blood were known as Asil and crossbreeding with non- Asil horses was forbidden. Mares were the most valued, both for riding and breeding, and pedigree families were traced through the female line. The Bedouin did not believe in gelding male horses, and considered stallions too intractable to be good war horses, thus they kept very few colts, selling most, and culling those of poor quality.

Over time, the Bedouin developed several sub-types or strains of Arabian horse, each with unique characteristics, and traced through the maternal line only. According to the Arabian Horse Association, the five primary strains were known as the Keheilan, Seglawi, Abeyan, Hamdani and Hadban. Carl Raswan, a promoter and writer about Arabian horses from the middle of the 20th century, held the belief that there were only three strains, Kehilan, Seglawi and Muniqi. Raswan felt that these strains represented body "types" of the breed, with the Kehilan being "masculine", the Seglawi being "feminine" and the Muniqi being "speedy". There were also lesser strains, sub-strains, and regional variations in strain names. Therefore, many Arabian horses were not only Asil, of pure blood, but also bred to be pure in strain, with crossbreeding between strains discouraged, though not forbidden, by some tribes. Purity of bloodline was very important to the Bedouin, and they also believed in telegony, believing if a mare was ever bred to a stallion of "impure" blood, the mare herself and all future offspring would be "contaminated" by the stallion and hence no longer Asil.

This complex web of bloodline and strain was an integral part of Bedouin culture; they not only knew the pedigrees and history of their best war mares in detail, but also carefully tracked the breeding of their camels, Saluki dogs, and their own family or tribal history. Eventually, written records began to be kept; the first written pedigrees in the Middle East that specifically used the term "Arabian" date to 1330 AD. As important as strain was to the Bedouin, modern studies of mitochondrial DNA suggest that Arabian horses alive today with records stating descent from a given strain may not actually share a common maternal ancestry.