Affiliation: | 1.Department of Veterinary Sciences,College of Agriculture, University of Wyoming,Laramie,USA;2.Department of Large Animal Clinical Science,Michigan State University,East Lansing,USA;3.The Danish Meat Association,Kjellerup,Denmark;4.Department of Large Animal Sciences, Group of Population Biology, Section for Veterinary Epidemiology, Faculty of Life Sciences,University of Copenhagen,Frederiksberg C,Denmark |