放し飼い牛舎における牛群の行動とくに牛舎内における牛群の分布について

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The position of cattle in a loose housing barn was investigated in a series of 24-hour observations at monthly intervals from October through December (in December, two consecutive 24-hour observations). The cattle consisted of 20-30 Holstein heifers and dry cows. The barn, which had an area of 414m^2,was divided by a hay rack into two separate areas (space ratio, 2 : 3). The position of individual cattle in the barn were recorded as coordinates on two imaginary grids (4x8 and 4x12) at hourly intervals. The social order was determined by observing outcomes of conflicts between cattle at feeding time. Ambient temperature and wind velocity and direction at flve points in the barn were recorded at hourly intervals. Almost all members of both herds were observed in the barn from 17 : 00 to 4 : 00,generally. Differences in ambient temperature among the five points in the barn were small. The wind velocity at each point was less than 0.5m/s at every observation. The social order of the heifers was slgnificantly consistent between October and November, and between November and December (rs=0.6727,P<0.05 and rs=0. 6242,P<0. 05,respectively). In dry cows, whose herd members changed frequently, such agreement in social order between observations could not be demonstrated. The positions of the cattle in the barn varied little during the night. Comparing the modal values for two consecutive days in December, the values for heifers coincided well, while less consistency was observed in dry cows. In the observations of November and December, the modal values of the heifer herd tended to coincide between months, but the values for dry cows were not in agreement between months. The association of social class with position in the barn was significant in heifers (P<0.001). In dry cows, this association was not significant. Jap. J. Livest. Management, 16(2) : 56-64,1980 (Received August 7,1980)
日本家畜管理学会の論文
1980-10-30

放し飼い牛舎における牛群の行動とくに牛舎内における牛群の分布について

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放し飼い牛舎における牛群の行動 とくに牛舎内における牛群の分布について

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放し飼い牛舎における牛群の行動とくに牛舎内における牛群の分布について