Simple SummaryThe central zone of Chile concentrates an important number of backyard production systems, where poultry species are the most commonly present in backyards, followed by swine. There is compelling evidence in the scientific literature indicating the circulation of zoonotic pathogens among backyard poultry and swine. As a result, backyards represent a significant animal-human interface that warrants further investigation. Previous studies have characterized poultry backyards in Chile; however, swine backyards have not yet been characterized. Therefore, the objectives of this study were to characterize swine backyard production systems in the central zone of Chile and to describe the value chain of swine backyard production. We found that backyard production is carried out in the context of the low implementation of biosecurity measures and that in most backyards, there is no animal health management in place; thus, the sanitary status of pigs is usually unknown. Moreover, a significant amount of movement of animals and animal products between different backyards was identified. These results suggest that swine backyards have biosecurity deficiencies that may play an important role in the risk of introduction and dissemination of animal pathogens or the emergence of zoonotic diseases and therefore require special attention.AbstractBackyard production systems (BPS) are highly distributed in central Chile. While poultry BPS have been extensively characterized, there remains a notable gap in the characterization of swine BPS in central Chile. In addition, there is evidence that zoonotic pathogens, such as influenza A virus andSalmonellaspp., are circulating in backyard poultry and pigs. A total of 358 BPS located in central Chile were evaluated between 2013 and 2015 by interviewing farm owners. Severe deficiencies in biosecurity measures were observed. The value chain of swine backyard production identified food, veterinary care (visits and products), and replacement or breeding animals as the primary inputs to the backyard. The most common origin of swine replacements was from outside the BPS (63%). The main outputs of the system were identified as meat and live animals, including piglets and breeding animals. In 16% of BPS, breeding animals were lent to other BPS, indicating the existence of animals and animal product movement in and out of backyard farms. Results from this study indicate that swine BPS in central Chile represents an animal–human interface that demands special attention for implementing targeted preventive measures to prevent the introduction and spread of animal pathogens and the emergence of zoonotic pathogens.