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Back Muscle Necrosis
See chapter 7 for further information.(409) This is believed to be a manifestation of the porcine stress syndrome and is associated with severe changes in the lumbar muscles that run down each side of the spine. The onset is sudden, often after exercise and the swollen muscles are extremely painful. The condition sometimes occurs in outdoor gilts that have heavy ham muscles, when they are moved into paddocks for the first time. Within five minutes or so a number of the gilts can be very stiff and lame. The condition can take two or three weeks to resolve and the breeding capacity of the gilts may be affected.
