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Electric cattle grids use electricity to deter animals from crossing the fence line. There are different designs. One uses high-tensile wire run across the roadway, about 3 to 4 inches (8 to 10 cm) off the ground, attached to a power source on one side. [17] The primary advantage is cost and ease of installation. [18]
Electric fences were used to control livestock in the United States in the early 1930s, [citation needed] and electric fencing technology developed in both the United States and New Zealand. [sentence fragment] An early application of the electric fence for livestock control was developed in 1936–1937 by New Zealand inventor Bill Gallagher.
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.
A fence is a structure that encloses an area, typically outdoors, and is usually constructed from posts that are connected by boards, wire, rails or netting. [1] A fence differs from a wall in not having a solid foundation along its whole length. [2] Alternatives to fencing include a ditch (sometimes filled with water, forming a moat).
[2] [3] Fences are usually designed with the target pest species (the species to be excluded) in mind, and the fences are made to effectively exclude those species. This results in a wide variety of designs for pest exclusion fences (see examples below). Often the fence is encircled in electric wire to ensure that animals can not climb over the ...
U.S. patent 167,240 – Jacob Haish, DeKalb, Illinois, Improvement in Wire-fence Barbs – "single piece of wire bent into the form of the letter S" so that both strands are clasped (1875) U.S. patent 185,346 – John Nelson, Creston, Illinois, Improvement in Wire-fence Barbs – barb installable on existing fence wire, (1876)
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