One of the characteristics of organic farming is the conservation of domestic, endogenous livestock breeds and strains. For a successful development of the organic pig sector in Southern Europe, the animals must be well adapted domestic breeds, as they are exposed to extreme weather conditions in the free range systems required by the EC Regulation No 1804/1999 (CEC, 1999). Van Putten (2000) proposed the use of small coloured breeds with large snouts in organic pig production.  Old domestic breeds are also a part of the inheritance of a country, and should be considered valuable for this reason. Data from the Bulgarian Ministry of Environment and Waters show that, as a result of human activity in the last few decades, six aboriginal breeds of livestock in Bulgaria have disappeared. Such losses do not reflect sustainable development of livestock breeding and good management of genetic resources.  Traditionally reared, old Bulgarian breeds are well adapted to domestic conditions and are resistant to diseases. For this important reason, they are preferred in organic farming, in which the use of medicines is limited. In Bulgaria, the East-Balkan pig is well-adapted to climatic conditions of continental climate and uses the natural, local food resources effectively.