Iowa State veterinarian Jeffrey Zimmerman said about 1 million pigs move across state lines each week to other farms, and that outbreak responses must start within hours. He added that growing herd sizes reduce herd immunity, making herds more vulnerable to disease.
Heavy pig movement and larger herds raise the risk of rapid disease spread, which could cut hog supply and shift demand for meal and feed ingredients if an outbreak occurs.
After 69 past neutral disease events, Lean Hogs moved a median -0.2% over 5 sessions (48% higher; middle half -1.4% to +1.5%), and -1.6% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.