The Saluki (Persian hound) is a standardised breed of dog, developed from sighthounds – dogs that hunt primarily by sight rather than scent – that was once used by nomadic tribes to run down game animals. The dog was originally bred in the Fertile Crescent. The modern breed is typically deep-chested and long-legged, and similar dogs appear in medieval and ancient art. A related standardised breed is the north African Sloughi. In 2014, a DNA study compared dogs and wolves for AMY2B (alpha amylase 2B), which is a gene and enzyme that assists with the first step in the digestion of dietary starch and glycogen. An expansion of this gene in dogs would enable early dogs to exploit a starch-rich diet as they fed on refuse from agriculture. Data indicated that the wolves and dingo had just two copies of the gene and the Siberian husky that is associated with hunter-gatherers had just 3–4 copies, 'whereas the saluki, which was historically bred in the Fertile Crescent where agriculture originated, has 29 copies'.
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