2.2.1 Farms
The present cross-sectional study was conducted in Greece, including a total of 59 pig farms. Inclusion and exclusion criteria for selected farms were, a minimum capacity of 40 sows, as well as the operation type of exclusive farrow-to-finish farms. The selected 59 farms had totally a population around 22.500 sows, which represents about 40% of entire capacity of Greek swine production. Moreover, only farms that the owner or pig farm manager agreed to participate in the study voluntarily, were finally included.