Results of radiological hip dysplasia monitoring in Tornjak breed

The aim of this retrospective study was to show the prevalence of hip dysplasia (HD) in the indigenous dog breed Bosnian and Herzegovinian -Croatian Shepherd Dog (Tornjak) in the period from 2001 to 2016. A total of 735 radiographs were evaluated according to the FCI protocol. Statistical analysis was performed using the Statistica 13.5.0.17. (TIBCO Software Inc.) software. Significant differences between categorical variables were analysed using the Chi-square test. The median value of age of examined dogs was 18 (13.8-26.0) months, with majority of dogs (523) under 24 months. In the overall examined population 74.97% of hip radiographs were interpreted as healthy (grades A and B) and 25.03% were interpreted as dysplastic (grades C, D and E). In dogs under 24 months of age, the most common age for HD survey, 76.86 % was interpreted as healthy and 23.14% as dysplastic. Comparing the frequency of diagnosed HD according to the breeding licence during the 15 years period there was a statistically significant increase in dogs with HD grades A, B, C, D and a decrease in dogs with grade HD E restricted for further breeding (P<0.05). Comparison of frequency according to the FCI standards (AB vs. CDE) showed no significant difference. The present study shows that the prevalence of HD was reduced over the 15 year period in Tornjak breed.