Abstract
The aim of the study was the analysis of the structure of the population, relationship coefficients, and inbreeding trends in terms of: sex, breeding system, and inbreeding degree of Tatra Shepherd dogs. The breed's inbreeding rate was 6.34%, and for a standardised 4-generation population was 6.68%. The highest inbreeding rate was found in "non-champion-dogs" and in "Polish dog" groups consisting of males and females. The limit value FX was exceeded for 25.65% of Tatra dogs, and the critical value was exceeded for 11.52%. An increasing ancestor loss coefficient (AVK) was found, which may result in an increased number of inbred animals. In particular, this referred to female dogs in the nCH, PL, and Z groups, whereas a significant increase of AVK was observed in the group of male dogs from foreign kennels. The resulting COR values were 55.58% for males and 55.44% for females.
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