New Zealand’s largest egg supplier, Mainland Poultry, is placing hundreds of thousands of free-range chickens into lockdown following the detection of the H5N1 bird flu virus in the country last week. The virus was first identified in a wild brown skua found on Lower Hutt’s Petone Beach last Wednesday, with a second case confirmed in a native kāhu, or swamp harrier, in the Wairarapa on Friday.

Mainland Poultry, which supplies nearly 40 percent of New Zealand’s eggs and manages more than 1.3 million hens, including around 550,000 free-range birds, is taking precautionary measures to contain the virus. Free-range eggs represent approximately 45 percent of the national market, underscoring the importance of managing the risk effectively.

John McKay, Mainland Poultry’s chief executive and chairman of the Egg Producers Federation, emphasized the need for a clear understanding of the outbreak's scope. He indicated that decisions about the birds would be guided by ongoing assessments of the virus’s spread. “We care deeply about our birds,” McKay said, highlighting the careful evaluation of the situation before proceeding with measures affecting the flocks.

Despite the challenges posed by the avian influenza detections, Woolworths, one of the country’s largest supermarket chains, has reassured customers that egg and poultry supply chains remain stable. A Woolworths spokesperson confirmed that contingency plans are in place to manage distribution and maintain product availability on shelves at current volumes. The retailer encouraged shoppers to maintain regular purchasing habits to avoid unnecessary disruptions.

New Zealand authorities continue monitoring the situation closely as the avian flu cases mark the first known presence of the H5N1 strain in the country. Efforts remain focused on containing the virus to prevent further transmission among wild bird populations and commercial poultry farms, which play a crucial role in the nation’s food supply.