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In 1962, another New Zealand inventor, Doug Phillips, invented the non-shortable electric fence based on capacitor discharge. [16] [17] This significantly increased the range an electric fence could be used from a few hundred metres to 35 km (~20 miles), and reduced the cost of fencing by more than 80%. [18]
These new, lightweight steel wire fences were not suitable for cattle, as cattle would lean over or on the fences and damage or push the fences over. When barbed wire became available in 1879, it was used as the top wire and perhaps a lower additional wire in conjunction with No. 8 wire on fences on dairy and cattle farms to prevent the animals ...
The tradition of fencing out unwanted livestock prevails even today in some sparsely populated areas. For example, until the mid-20th century, most states in the American West were called "open range" ("fence out") states, in contrast to Eastern and Midwestern states which long had "fence in" laws where livestock must be confined by their owners.
Nofence is a Norwegian company that makes GPS collars for farm animals (cattle, sheep, and goats) that discourage them from crossing virtual fences. [1] [2] Oscar Hovde Berntsen has been working on the idea of virtual fencing, as an alternative to fixed electric fencing, since the 1990s. [3] Nofence was incorporated in 2011. [3]
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A pest-exclusion fence is a barrier that is built to exclude certain types of animal pests from an enclosure. This may be to protect plants in horticulture , preserve grassland for grazing animals, separate species carrying diseases ( vector species ) from livestock, prevent troublesome species entering roadways, or to protect endemic species ...
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