Free-range eggs no longer available in UK due to bird flu

People can no longer buy free-range eggs in the UK due to the length of time hens have been kept indoors following outbreaks of bird flu.

The eggs in shops will be labelled as "barn eggs" due to birds being kept inside for more than 16 weeks.

The country is experiencing its largest ever outbreak of avian influenza and measures are in place to prevent the virus from spreading.

About 55% of all eggs produced in the UK are free-range, says the RSPCA.

It means they come from birds that, during the daytime, enjoy unlimited access to outdoor pastures.

Signs will be put in supermarkets to inform shoppers of the change from Monday, and free-range labelling will only return when hens are permitted to go outside again.

• Human case of bird flu detected in the UK

• Birds culled amid multiple outbreaks of avian flu

Aimee Mahony, chief poultry adviser at the National Farmers' Union, said the government's advice was that there was "still a high level of risk" to birds of catching flu.

"This is an incredibly difficult time for all bird owners and vigilance remains vital," she added.

Ms Mahony said farmers were following "stringent biosecurity measures" and adapting hen houses to make birds more comfortable.

What are barn eggs?

Avian flu is spread by close contact with an infected bird, whether it is dead or alive

Both "barn" and "free range" eggs meet the RSPCA's welfare standards, because the hens that lay them have freedom and space to move around, along with perches for roosting and nest boxes.

The difference is that for barn hens, this all happens inside, whereas free-range hens can access to the outside through "popholes" - although bird flu restrictions have put a stop to this.

The RSPCA says consumers buy more boxes of free range and barn eggs than those from caged hens.

However, the charity says a large proportion of eggs used as ingredients in products like mayonnaise, cakes and sandwiches are still from hens kept in cages.

It says such cages provide less than the size of an A4 piece of paper of space per bird and have limited facilities for perching, nesting and scratching and do not meet its welfare standards.

The charity says about 35% of egg-laying hens are still kept in cages.

Case numbers of the H5N1 strain of bird flu began rising in November last year. The virus - which is highly contagious and can destroy poultry flocks - was first discovered in North Yorkshire.

It poses an extremely low risk to humans, according to the NHS, although several people have been infected around the world and a number have died.

The outbreaks have resulted in the government enforcing an Avian Influenza Prevention Zone which made it a legal requirement for all bird keepers across the UK - whether they have pet birds, commercial flocks or just a few birds in a backyard flock - to keep them indoors and follow strict biosecurity measures.

Under such restrictions egg farmers have a 16-week "grace period" to maintain their free-range status, but this ended on Monday.

Andrea Martinez-Inchausti, assistant director of food at the British Retail Consortium, said shops and supermarkets would "continue to support British farmers".

In a statement the government said it would work with farmers and retailers to implement the branding changings.

A spokesman added: "We are experiencing our largest ever outbreak of avian flu and housing measures remain in force to protect poultry and other birds from this highly infectious and unpleasant disease."