Application and development of precision livestock farming technologies to improve transparency in pig husbandry - A systematic literature review using PRISMA

There is an increasing demand for higher animal welfare and environmental standards in pig production, as well as better transparency and traceability. Since PLF technologies could facilitate the optimization of transparency and traceability from farm to fork, the objectives of the study were to explore commercially available PLF technologies and to review the literature to identify technologies under development. Google's search engine was used to find commercially available PLF systems for pigs. PLF systems were only included if the manufacturer's website was in English. Additionally, a systematic literature search was conducted according to PRISMA. Scopus and Web of Science were used as databases, and 18 search terms were composed of, e.g., the animal term "pig," the PLF term "automatic feeder," and terms related to development. Only English peer-reviewed articles published between January 2003 and December 2023 were considered. There were 496 manuscripts devoted to animal behawior-related technologies, 160 to environmental monitoring technologies, and 12 related to software used to manage pig farms. Further, 122 commercially available PLF technologies were found for monitoring feeding and drinking behawior, health-related traits, and physical and environmental parameters. While there are fewer environmental monitoring technologies in development compared to commercially available ones, the opposite is tnie for animal-related technologies. In light of the array of environmental and animal-related technologies currently available for pigs and the ongoing developmental process, there is a potential for increased transparency in pig farming. However, this would primarily be at the group level and depend upon the integration of data from a range of monitoring technologies.