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They can be made from a wide variety of materials, depending on terrain, location and animals to be confined. Most agricultural fencing averages about 4 feet (1.2 m) high, and in some places, the height and construction of fences designed to hold livestock is mandated by law. A fencerow is the strip of land by a fence that is left uncultivated.
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]
High-tensile wire is made with thinner but higher-strength steel. Its greater strength makes fences longer lasting because it resists stretching and loosening better, coping with expansion and contraction caused by heat and animal pressure by stretching and relaxing within wider elastic limits.
A horse behind a vinyl fence of flexible "rail" and coated wire. A synthetic fence, plastic fence or (when made of vinyl) vinyl or PVC fence is a fence made using synthetic plastics, such as vinyl , polypropylene, [1] nylon, [2] polythene (polyethylene) ASA, or from various recycled plastics. Composites of two or more plastics can also be used ...
Most electric fences are used for agricultural fencing and other forms of non-human animal control, although they are also used to protect high-security areas such as military installations or prisons, where potentially-lethal voltages may be used. Virtual electric fences for livestock using GPS technology have also been developed.
From the early 1960s, high-tensile 12½ gauge (2.5 mm) steel wire has largely replaced number 8 wire for New Zealand fencing, as it is lighter and cheaper, though also more difficult to work. [4] Since 1976, when New Zealand adopted the metric system , number 8 wire is officially referred to as 4.0 mm gauge wire, although the older term "Number ...