島根大学農学部研究報告

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島根大学農学部研究報告 4
1970-12-15 発行

裏山放牧和牛の行動とエネルギー消費量について

On the Behaviours and Energy Expenditure in Japanese Black Breed of Cattle
加藤 正信
ファイル
内容記述(抄録等)
Grazing behaviours and energy expenditure were studied in autumn with two cows (Japanese Black Breed) grazed on the mountain range(about 10 ha.) neighbouring the farm-house. The data gained in this experiment were compared with the results reported previously.
The results obtained were summarized as follows :
1. Both grazing hours and ruminating hours were a little longer, and resting hours and loafing hours were a little shorter than those of cows on the natural grass-land. The 24-hour histogram of grazing and ruminating time showed the typical autumn-type, being almost similar to that on the natural grass-land.
2. The walked distances during 24 hours were 3.25 and 4.87 km. in the two cows, respectively. These were about half as far as those on the natural grass-land.
3. The daily energy expenditure per kilogram of body weight was 15.64 kcal. in average ; it was about 80% of that on the natural grass-land. It was found that behaviours of grazing cows on the range neighbouring the farm-house were not so active as on the natural grass-land.
4. From these results, it was concluded that the cattle-grazing on the range neighbouring the farm-bouse was profitable from the viewpoint of grazing behaviours and energy expenditure.