SHARING OPTIONS: One of Pat McKenna's Dexter cows which will be going up to graze on the Slieve Beagh hills in Co Monaghan. \ Claire Nash Monaghan farmer Pat McKenna keeps 100 head of Dexter cows and followers on 70ac in the foothills of Slieve Beagh in Co Monaghan and, this summer, he will be trialling virtual fencing for 20 weanlings on the hills. McKenna also has a sizeable portion of land on the mountain, which has peatland-type soil. He plans to put the weanlings up on the hills by the end of the month. “I’m in the process of getting 20 collars from a Norwegian company called Nofence.