Pig farmers have been warned pigs sharing premises where avian flu has been detected in poultry could be culled if they are found to be carrying the disease.Farmers could also be required to undertake costly cleansing and disinfecting procedures, if avian flu is found on premises where both pigs and poultry are present.The National Pig Association (NPA) has been seeking clarification from Defra about the situation for pig farmers, as the H5N8 strain of the disease has been confirmed at various poultry premises over the winter.These include three linked premises on a commercial game farm in Lancashire, three separate poultry farms in Lincolnshire and backyard flocks in North Yorkshire and Carmarthenshire. A number of pig farms have been caught up in restrictions put in place around these premises.Defra said in a statement: "The strong take-home message for farmers and pig keepers is that they should be aware, and take account, of the risks of keeping poultry and pigs on the same premises. "If they do keep them on the same premises, it is very important that they are kept totally separate and that indirect contacts, for example, through people or equipment are also prevented."NPA chief executive Zoe Davies reiterated the need for pig farmers to be aware of the risk and to take pre-emptive action to reduce it.She said: "The Defra advice confirms pigs can become infected with HPAI and it is a concern that pigs on a shared site will have to be tested and could be culled if proven to be positive."I would like to reiterate our advice to pig producers to remove any hens around a pig unit."