放し飼い牛舎における牛郡の行動とくに牛舎利用度の年内変化について

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A series of twelve 24-hour behavioral observations on loose housing Holstein cattle were conducted to determine the variation in the number of cattle using barn diurnally and seasonally. Experimental cattle were consisted of 10-17 dry cows and l0-13 heifers. These herd were kept in outdoor exercise lots and in a 414m^2 barn that has been divided by hay rack into two areas for each herd. The number of cattle observed in the barn, their behavioral pattern and indoor and outdoor ambient temperatures of the barn were recorded in 24-hour observations with monthly intervals from July 1977 to June 1978. In July and August, the number of cattle in the barn increased in daytime, while it increased at night during September through November and April through June. During December through March, the herd stayed in the barn for almost 24 hours a day. Dry bulb temperatures (DBT) at which cattle started moving into the barn at night coincided well with means of DBT of each 24-hour observation, except from January to March. The seasonal variations in the 24 hr-mean and the nighttime mean of the number of cattle observed in the barn were both negatively correlated to seasonal variations of mean values of DBT (r=-0.8946,P<0.01 and r=-0.9122,P<0.01), and these variations of the number of cattle in the barn would be related to snowfall. The variation in the daytime mean of the number of cattle observed in the barn Increased when means of DBT have been more than 20℃ and less than 0℃.
日本家畜管理学会の論文
1980-03-07

放し飼い牛舎における牛郡の行動とくに牛舎利用度の年内変化について

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