Keystone or “Guillotine” Dehorning
A keystone dehorner has two handles that move a blade downward against a plate or another blade, slicing through the base of the horn and surrounding skin.
Advantages: Can be used in older cattle with large horns.
Disadvantages: Greater risk of exposed sinus, infection and blood loss; painful; may lead to set-backs in overall health and performance, including weight loss; requires follow-up care; poses risk of injury to the animal and handler.
Watch a video of a calf being dehorned with a keystone dehorner. Caution: Graphic content.