Fire and Emergency crews have responded to an early morning blaze at a Whanganui poultry shed.

A Fire and Emergency spokesman said crews were alerted to the Papaiti Rd fire around 12.45am, and found it "well-involved" on arrival.

The shed is approximately 150m by 20m and has partially collapsed as a result of the blaze.

Crews at the scene were damping down hotspots by 2.30am.

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Several fire appliances and water takers from around the region were called to the scene including some from Marton and Palmerston North.

A specialist Fire and Emergency investigator is working to determine the cause of the fire.