I'm doing a commercialization assessment on a technology developed and patented by the USDA, called the virtual fence. Perhaps you've heard of it. It uses ear tags to give an audible cue to cattle (and possibly other animals) to get an animal to move in a desired location. If the audible cue doesn't work it is followed by mild electric shocks (up to three) to try to train the animal to respond to the audible cue. The idea is to use the technology to remotely cue the animals to move to another grazing location, and to control stock density. My job is to see what prospective users think of such technology. Do you think cattle can be trained to respond to audible cues? It seems particularly suited for controlled grazing, and yet I'm not clear on just how widespread that is being used. Any ideas? The USDA has info on the technology at <A HREF="http://www.macaulay.ac.uk/gps/gps_abstract_2001.pdf" TARGET="_blank">http://www.macaulay.ac.uk/gps/gps_abstract_2001.pdf</A>, <A HREF="http://patft.uspto.gov/netahtml/srchnum.htm" TARGET="_blank">http://patft.uspto.gov/netahtml/srchnum.htm</A>, and <A HREF="http://www.geospatial-online.com/geospatialsolutions/article/articleDetail.jsp?id=65014&pageID=2" TARGET="_blank">http://www.geospatial-online.com/geospatialsolutions/article/articleDetail.jsp?id=65014&pageID=2</A>. I'd appreciate any thoughts you might have. Thanks!