Some management situations are thought to predispose pigs to outbreaks of acute hemorrhagic proliferative ileitis, says Tom Fangman, University of Missouri veterinarian. These situations include:
1. Young adult pigs (four to 12 months of age) involved in boar and gilt performance testing programs.
2. Gilts within breeding programs that involve transporting them to new facilities.
3. The movement and mixing of boars and gilts into breeding groups.
4. Times of social and environmental stresses.
5. Changes in antibiotic use associated with the management strategies noted above.
6. Genetic line – white breeds, particularly Landrace, Large White and synthetic commercial genetics that incorporate those breeds are thought to exhibit an increased susceptibility, says Fangman.
7. Periods of extreme weather, where extreme temperature swings between night and day occur. Also hot, humid weather can have an impact.