AUTHOR=Rosa Guilherme J. M. TITLE=Grand Challenge in Precision Livestock Farming JOURNAL=Frontiers in Animal Science VOLUME=2 YEAR=2021 URL=https://www.frontiersin.org/journals/animal-science/articles/10.3389/fanim.2021.650324 DOI=10.3389/fanim.2021.650324 ISSN=2673-6225