Fire crews are tackling a blaze at a food processing plant in Bretherton, near Chorley.
Six fire engines were called to the blaze at a farm on Liverpool Road just after 7.30pm on Wednesday.
Approximately 100 tonnes of animal feed is ablaze, the cause of the fire as yet unknown.
There have been no casualties and livestock has been led to safety.
Firefighters will be at the scene for several hours yet damping down the fire.
Fire engines from Tarleton, Penwortham, Merseyside, Leyland, Ormskirk and the control unit from Fulwood fire station attended.