Abstract
The behavior of escaping from fences with slackening wire was studies about the flock of 22 cattle with mean height of 130cm and mean weight of 570kg by 2 experiments. One was experimented by using the fences with no slackening wire and with slackening wire of 10cm in the center of span of fence. The other was experimented by using fences with no slackening wire of the vertical corner post and with slackening wire after the corner post was tipped by about 5 degrees inside pasture. In the former experiment, the frequency of sticking cattle's poll out of fences with slackening wire was only 1.3-1.4 times frequency in fences with no slackening wire, but the behavior of escaping from fences with no slackening wire was hardly found. The behavior of escaping in the feed distance of 1m from fence line was found frequently in the wire space between 50 and 90cm above ground, which space was 38-70% of the withers height of flock. In the later experiment, the sticking in fences with no slackening wire was more frequent rather than in fences with slackening wire, but the behavior of escaping was found frequently in fences with slackening wire. These escaping behavior made a 47-81% decrease in the wire tension of no slackening wire fences, but the change of wire tension in the slackening wire fences after the experiment was a little. The escaping was caused by the cattle experienced in escaping or the cattle with comparatively lower withers height, and the characteristic behavior of flock was observed that the cattle being just about to escape led other cattle to escape from fences.
