Virtual-livestock fence

Building and maintaining fences for controlling livestock places a huge financial burden on agricultural producers worldwide, but is there really any need for all those posts and wires? This is the question posed by the Australian Commonwealth Scientific and Research Organization (CSIRO) which has come up with a virtual fencing solution applicable to cattle and sheep farming. Using a GPS system to define fence boundaries and a specially designed collar that alerts the animal to the fact that it has reached the “fence”, a prototype of the system has now been successfully demonstrated on a herd of cattle. (more)

Boy this would sure be nice except for fitting all those pesky collars!