76. Replacement breeding stock introduced from another unit, especially an indoor unit, should be acclimatised to the conditions of an outdoor site before integration with the rest of the herd. The duration of their isolation from the main herd should be at the recommendation of a veterinary surgeon. Pigs reared on indoor units will be particularly susceptible to extreme weather conditions so a suitable site and appropriate accommodation, shade and wallows should be provided. The pigs' awareness of, and level of training to, electric fencing and water supply should also be considered.