Tested were 1788 purebred Arabian fillies and colts raced during the following periods: I (seasons 1927-1939), II (seasons 1946-1961) and III (seasons 1962-1992). There were divided into groups according to quantities of horses submitted to performance trials (more than 20 heads, 5-20 and less than 5 ones). It was found, that in greater herds more often occurred extreme values of coefficients of success per head. The highest value was observed in the I period and resulted 1.73.
Von Willebrand's disease (vWD), one of the most common congenital bleeding diatheses caused by a deficient or defective von Willebrand's factor (vWF), is found in different breeds of dogs. The objective of the study was to perform a preliminary analysis of the knowledge and awareness of von Willebrand's disease among dog breeders and owners in Poland. The online survey was addressed to dog breeders and owners, comprised 25 questions and was voluntary and anonymous. It was placed on 12 thematic Internet forums dedicated to different breeds of dogs. The respondents provided 231 answers, 76 of which were complete. The results of the survey indicate that the dog breeders and owners are highly interested in genetic tests and want more general access to scientific information. By their own admission, the dog owners and breeders have partly insufficient knowledge about vWD. Considerable gaps in their knowledge about other issues (including breeding work) were also evidenced. Being a contribution to the discussion about canine vWD, this article highlighted the need to improve the education of dog breeders and owners, and to make them aware of their role in canine health care.