The influence of Orlov trotter at horse breeding in Bulgaria since1893 till now a studied. The first import the Orlov stallions and mares was purebred breeding and after that they were crossed with local halfbred horses. The end of XIX and beginning in XX century (to 1926) the number of covered mares were 24 800 in the 5 stud farms. The study of line and family genealogic structures at the period of the purebred breeding and the 1960 the mares was covered of stallions of other trotter breeds. In the middle on XX century was imported the stallions of line Udaloy Crolik and Voin. The family structure was present of mare Zakrasa, Kadetka, Itka etc. The observed mean values for the examined 4 exterior measurements and their race results on1600 m.

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