Monkeys at a research centre have their penises zapped with electricity until they ejaculate, an animal rights charity has said.
US charity PETA (People for the Ethical Treatment of Animals) sent someone undercover into the Wisconsin National Primate Research Center.
Over the course of six months the investigator watched how close to 2,000 monkeys were treated at the University of Wisconsin–Madison run lab.
According to the PETA report published this week workers at the lab referred to certain monkeys as 'semen donors'. "Typically, the monkeys are fitted with metal collars, and workers use poles that fasten onto the collars to pull them out of their cages by the neck," the report reads. "The monkeys are then strapped into a restraint
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