The loss is expected to top $1 million in a barn fire in Warwick Township, which is being investigated by the Fire Marshal.
Lambton OPP say crews from six area volunteer fire departments were called to the scene in the 5500 block of Arkona Road shortly after 8 o'clock Wednesday night.
Police say the structure was engulfed in flames by the time firefighters arrived.
More than 4,000 hogs were lost in the blaze, which took crews several hours to bring under control.
The Fire Marshal is investigating the cause, and says the origin of the flames is not suspicious.