Slovenian autochthonous breeds are those that originated in the territory of the Republic of Slovenia. We have 18 Slovenian autochthonous breeds of domestic animals, of which 12 are breeds of farm animals used for food and agriculture. Today some of our autochthonous breeds of farm animals are endangered. In the year 2003, the Register of breeds and zootechnical assessment (2019) was established. Until 2013, the Public service for Farm Animal Genetic Resources Conservation has estimated the level of endangerment of farm animals in accordance with the Rules on preserving biodiversity in livestock breeding (2020). Since 2014, the Rules on amendments to the Rules on preserving biodiversity in livestock breeding have been in force (2014). In the master's thesis we analyzed the previous and today valid endangerment criteria. For each breed the information for the level of endangerment, the population size, the number of female and male animals used for breeding were presented graphically. We obtained data from the Register of breeds and zootechnical assessment (2019) for the period from 2003 to 2019. During this period the populations increased in most breeds, but due to updated criteria, the final level of endangerment for most breeds is »critical«. In 2019, the level of endangerment in eight Slovenian autochthonous breeds was »critical«, namely the Lipizzan horse, the Slovenian cold blooded horse, the Posavje horse, the Bovec sheep, the Bela Krajina pramenka, the Istrian pramenka, the Drežnica goat and the Karst shepherd. Among the autochthonous breeds, three breeds had »endangered« level, namely Cika cattle, the Styrian hen and Krškopolje pig. The Jezersko-solčava sheep had »vulnerable« level of endangerment.
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