All Orlov Trotters trace back in the male line to the Arabian stallion Smetanka. The three breeds of trotter in Russia are the Orlov Trotter, the Standardbred Trotter and the Russian Trotter. Any horse not Orlov or Standardbred is by definition a Russian Trotter. An Orlov Trotter may carry the blood of other breeds up to a maximum of 12.5%, so it is therefore possible for an Orlov Trotter to trace back in the male line to a stallion other than Smetanka. All Russian Trotters carry less than 87.5% Orlov blood and most trace back in the male line to Rysdyks Hambletonian. Russian Trotters that descend from Smetanka include Burlak (1901), Koldun (1929) and Talantlivyi (1932). The Orlov Trotter Pilot (1932) was by the Russian Trotter Giatsint (1925) by the Russian Trotter Burlak (1901) by the Orlov Trotter Bystrolet (1893). Registration numbers, which were introduced at the start of the twentieth century, are used to identify the breeds. Orlov Trotters have numbers beginning 1 through 9 while Standardbred Trotters and Russian Trotters have numbers beginning 0.