Northland's position as a major beef producer makes it particularly vulnerable to cattle disease Mycoplasma bovis, a regional farming leader says.

Northland Federated Farmers dairy chairman Ashley Cullen said beef farming systems had highly mobile stock flows, making them particularly vulnerable to M. bovis due to the large number of young stock that farmers brought into the region.

Northland farmers buy in stock from around the country and the reverse happens too.

The typically younger stock is grown to heavier weights to produce beef for New Zealand's export and local markets. Young stock could be sourced from dairy or beef

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