Whilst PCV2 vaccination is expected to improve growth in finishers, care will be needed not to compromise this by overstocking if mortality rates decline significantly. A reduction of 5% in mortality will leave an extra week’s worth of pigs on farm in a breeder-feeder. Until the long term benefits of PCV2 vaccination are recognised and realised, the balance between numbers on farm increasing due to reduced mortality and reducing due to faster growth, a careful watch must be kept on stocking rates.