Abstract
The behavior of cattle escaping from fence is apt to occur mainly at the time of sticking into the wire space of fence during the grazing in the pasture. It is necessary to study the fence structure to prevent the escaping as possible. The experiment in the various fence structure was carried out for two Japanese Shorthorn cows with mean withers height of 127 cm and two Japanese Black Cattle cows with mean withers height of 126 cm respectively. These fences had the post spacing of 2, 3, 4, 6, 8 and 12 m with combination of 3-barbed wire, the 4-barbed wire, the 4-combinated wire of barbed and round wire, the 5-barbed wire and the 5-wire combination. The frequency of cattle sticking increased with Japanese Black Cattle rather than Japanese Shorthorn, and with the wire combination fence than the barbed wire. The total sticking time in each fence structure was shorter as the frequency of sticking increased. The difference between each post spacing was not clear in the sticking behavior. The maximum post spacing was decided as 6 m by the investigation of mean time of sticking into each wire space in 4-barbed wire fence. Since the cattle sticking behavior of falling on one's front knees was found almost under 40 cm height in the 5-wire fences, the lowest wire height above the ground should be under about 30 cm and the wire spacing between about 30 〜 80 cm should be made stronger. The percentage of dropping the wire tension after the cattle sticked into the fence was found in the upper wire, in which the frequency of sticking increased. These dropping of wire tension was found more with Japanese Black Cattle rather than with Japanese Shorthorn and more with the combinated wire fence than the barbed one.
