AUTHOR=Dahl Geoffrey E. , Connor Erin E. TITLE=Grand Challenges to Livestock Physiology and Management JOURNAL=Frontiers in Animal Science VOLUME=2 YEAR=2021 URL=https://www.frontiersin.org/journals/animal-science/articles/10.3389/fanim.2021.689345 DOI=10.3389/fanim.2021.689345 ISSN=2673-6225