(CNN) — About 300,000 hens were killed by a fire at a poultry farm in southwestern Michigan, CNN affiliate WWMT reported.

Multiple fire departments responded Friday to the barn fire at the Konos Inc. egg farm, a distributor of Vande Bunte Eggs, in Otsego Township, Michigan, the station said.

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The barn was destroyed but about 50 farm employees were uninjured by the blaze, said Brian Burch, a spokesman for Konos Inc. Fire crews had to bring in water trucks to fight the fire over several hours.

“Agriculture fires are always a challenge, especially at a place like this. We don’t have city water, we don’t have those same kinds of assets that we sometimes take for granted in cities,” he told WWMT.

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Another 250,000 hens housed in a nearby barn were unharmed, Burch said.

The cause of the fire remains under investigation.

The cage-free poultry farm, about 31 miles south of Grand Rapids, produces about 550,000 eggs a day, Burch said.

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