The attackers must have killed the helpless animals “with their bare hands,” farmer Michael Lüft from Seligenstadt, southeast of Frankfurt, said.
“You would need a certain amount of strength to do that.”
Whoever was behind the killings broke into the hen stalls by force.
Some of the birds had their heads completely torn off, while others had the skin and sinews torn from their bodies and pulled over their heads.
Police said that the violence of the act meant that witnesses must have seen or heard something.
“The animals must have been correspondingly terrified and caused noise,” a police spokesman in Offenbach said.
Officers believe that several perpetrators were behind the violence. The culprits also threw eggs against the walls and tipped over a number of barrels containing feed and water for the chickens.
Investigators are now calling for members of the public to come forward if they saw or heard anything.