The government wants bird keepers in England, Scotland and Wales to put in place strict measures to stop the spread of bird flu.
The measure was introduced by the Department for Environment, Food and Rural Affairs.
Last week it was introduced in Norfolk, Suffolk and parts of Essex.
The risk to human health from the virus is very low.
The AipZ was declared by the chief veterinary officers from England, Scotland and Wales to stop the spread of the disease.
All bird owners were not asked to bring their animals inside.
The government wants keepers with more than 500 birds to restrict access to non-essential people. Workers would need to change their clothing and footwear before entering bird enclosures, and site vehicles would need to be cleaned and disinfected frequently to limit the risk of the disease spreading.
"Bird keepers have faced the largest ever outbreak of avian flu this year and with winter brings an even more increased risk to flocks as migratory birds return to the UK," the chief veterinary officers of England, Scotland and Wales said in a joint statement.
It's the best form of defense.
The UK Health Security Agency advised that the risk to public health from the virus was very low, while the Food Standards Agency advised that the risk to consumers was very low. Eggs are safe to eat, according to it.