The government's chief veterinary officer said they did not rule out another lockdown in the UK due to "unprecedented levels" of bird flu.
The country has seen its biggest outbreak in the past year, with over 170 cases.
From Wednesday, birders in parts of Norfolk, Suffolk, and Essex must keep their birds indoors and follow stringent biosecurity measures.
Christine Middlemiss described the increase in infections as a "global phenomenon."
The cases have been reported locally on at least 17 campuses since last month.
Middle on Saturday, the mandatory housing measures apply to all poultry and captive birds, regardless of type or size.
After several outbreaks last month, the affected areas were placed in the Avian Influenza Containment Zone.
Alistair Bryce, who owns Havensfield Eggs in Eye, Suffolk, told the BBC he believed the current Defra strategy was "not working."