Influenza Virus Surveillance in Coordinated Swine Production Systems, United States
Bryan Kaplan, Jennifer DeBeauchamp, Evelyn Stigger-Rosser, John Franks, Jeri Carol Crumpton, Jasmine Turner, Daniel Darnell, Trushar Jeevan, Myoung-don Oh, Abbey Harding, Richard Webby, and James F. Lowe
Author affiliations: St. Jude Children’s Research Hospital, Memphis, Tennessee, USA (B.S. Kaplan, J. DeBeauchamp, E. Stigger-Rosser, J. Franks, J.C. Crumpton, J. Turner, D. Darnell, T. Jeevan, G. Kayali, R.J. Webby); Lowe Consulting Ltd., Albers, Illinois, USA (A. Harding, J.F. Lowe); University of Illinois College of Veterinary Medicine, Urbana, Illinois, USA (J.F. Lowe).
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Figure 1
Figure 1. Flow of animals through a closed swine production system. Coordinated swine production systems maximize desired animal traits and weight gain. High-quality breeding sows grown and bred in multiplier farms (MF-Gilts) were sampled transfer to commercial gilt development farms (GDU), where they were sampled again at exit (6 months). At ≈3 weeks of age, piglets were sampled before weaning (MF-Pigs). Mature gilts were transported from the GDU to 1 of 4 commercial breed-to-wean (BTW) farms, where samples were collected from gilts before entry and piglets before weaning.
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