Factors driving pig owners' motivation and satisfaction to perform eradications from Swine dysentery

Brachyspira hyodysenteriae is one of the agents of swine dysentery (SD) and its eradication is an effective, but costly control measure. Being a voluntary measure, knowledge about drivers of motivation and satisfaction regarding the eradication of SD would help to convince farmers to eradicate. We aimed to describe eradications performed in Switzerland and to analyse factors influencing the pig owners' perception (motivation and satisfaction) of SD eradications to provide a basis to formulate recommendations and guidelines. Pig farmers (n = 68) having conducted an SD eradication and being interested in the study were interviewed using a standardised digital questionnaire. We assessed their motivation as moderately or highly motivated. Based on the farmers' evaluation of nine aspects of the eradication, satisfaction was considered to be moderate (<7/9 aspects positively evaluated) or high (≥7/9). Farms with fattening pigs and farms with breeding stock were analysed separately in subsets. First, multivariable factor analysis for mixed data (FAMD) were performed to describe the main patterns of variation. Then, risk factors for motivation and satisfaction were quantified by means of logistic regression models. Mainly total depopulations (73.5%) had been performed. Of the 36 farmers with breeding pigs, 24 were highly motivated, and 20 highly satisfied. Of the 61 farmers with fattening pigs, 45 were highly motivated and 42 highly satisfied. The FAMD revealed that the two main components explained only 17.0% and 11.0% (breeding stock) and 13.0% and 11.0% (fattening pigs) of the total variation, respectively. For farmers with breeding stock no significant factors for motivation were detected, but they were more satisfied (OR 25.0) when they had a batch farrowing of 3 weeks. Farmers with fattening pigs were more likely to be more motivated when providing access to outdoor areas (OR 3.3) and when it was their own initiative (OR 5.5). Farmers were more likely to be satisfied when they had only fattening pigs (OR 5.7), when the eradication was their own initiative (OR 5.5) and when they did not disinfect the barns during the eradication (OR 15.6). Farmers deciding themselves to eradicate are presumably more likely convinced of the benefits of the eradication. Satisfaction associated with a 3-weeks batch farrowing might be related to an easier to organise eradication and no disinfection to reduced labour and costs. In summary, the majority of the farmers were satisfied with the eradication. Education could promote self-motivation of farmers, and subsidies might support the implementation of SD eradications.