3. Results and discussion
3.1. Participating farms and animals
During May 2012 and December 2013, 287 farms
registered for study participation of which 141 farms were
visited. As two farms were not located in the study region,
139 farms (45 F1-farms, 47 F2-farms and 47 K-farms) were
included in statistical analyses, whereby the predefined
sample size was reached. The distribution of the farms
according to the federal states and epidemiological
category (F1, F2, K) as displayed in Table 1 reflects the
distribution in the target population.