Modern Farmer reports on a "no fence" system for goats. Unlike "no fence" systems for cats and dogs, no buried wire marking the boundary is needed, just GPS and other sensors.
It seems as if the same technology would work for any mammal, which would mean an end to one spring routine--fixing fence, which involved replacing fence posts which had rotted, driving in fence posts which were still good but had been heaved up by the frost, replacing rusted out barbed wire, etc.
Laws about fencing date back centuries. Depending on the agriculture in the area sometimes it was the responsibility of the animal owner to fence his herd in, in other areas the responsibility of the crop grower to fence out free roaming animals. "No fence" tech would seem to be the responsibility of the animal owner.
One blogger I follow is Foothill Agrarian who raises sheep in California. He and some of the organic farmers have a system where they move their grazing animals from one field to another, or paddock to another, which involves movable fences. Invisible fences would ease that work.
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