Mr Eustice gave an example from his family who own a herd of South Devon cattle, and recalled how one of his father's cows, Rose, had to be put down. "It was soul-destroying," he said. Geronimo's ...

The herd of 10 red Devon cattle are wearing collars with GPS trackers to help keep them in the area. National Trust staff can use the virtual fence technology to guide the cows with sound cues to ...