JOHANNESBURG, South Africa — The owner of an exotic game reserve in South Africa is taking a drastic step to prevent rhino poaching: he has injected his rhinos' horns with poison.

Damian Vergnaud, owner of Inverdoorn reserve near Cape Town, said he approached scientists and a vet to work towards finding a substance that would deter poachers.

A record number of rhinos have been killed for their horns this year in South Africa, which has more rhinos than any other country thanks to conservation efforts.

The poaching is fueled by demand for rhino horns in Vietnam and other Asian countries, where they are used in traditional medicine despite the fact that experts say they have no medicinal value.

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Vergnaud told the South African Press Association that he decided not to dehorn his rhinos, like some game reserves have done, because it is "very painful" and "traumatizing" for the animals.

"I really wanted to create a different defense system," he told SAPA.

In tests, Vergnaud injected his rhinos' horns with a combination of three non-lethal substances: one with a terrible taste, one to make a horn visible on an X-ray machine, and one that is a dye, the same dye used to foil cash-in-transit robbers.

"We hope that it will inform poachers, it [poaching at the reserve] is going to be a waste of time," Vergnaud said.

Vergnaud has offered to share his home-brewed poacher repellent with other game reserve owners looking to protect this endangered animal.

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