ADVANCE FOR WEEKEND EDITIONS, DEC. 24-25 - In this Dec. 14, 2016 photo, a sign warns visitors, as disease is a major concern for the Spronk Brothers hog farm near Edgerton in southwest Minnesota. Starting January 1, they and other U.S. livestock producers will have to comply with new federal rules designed to reduce the use of antibiotics in farm animals. (Mark Steil/Minnesota Public Radio via AP)
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