寒冷の乳牛生体に及ぼす影響

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The author investigated the influence of low temperature on the bodily conditions of 6 dairy cows which were kept on the snow in the shade of a building for 8 hours (from 7 a.m. to 3 p.m.) daily for one week during the coldest season in Obihiro district, Hokkaido, by surveying their rectal temperatures, pulses and respirations three times (at 9 a.m., noon and 3 p.m.) a day. The results of the experiments were as follows: (1) At 9 a.m. out of doors, the rectal temperatures were higher by 0.11°-0.43℃. than in the dairy barn, whereas at noon and 3 p.m. the differences of the temperatures were so small that the curves of variations were smooth. The diurnal variations in the rectal temperatures were also very small. (2) As to the pulse numbers at 9 a.m., slight increases were observed in 2 cases. (3) No significant variations were observed in the respiration numbers. (4) During the experiments the mean temperature was 0.6℃., the mean wind-velocity 2-6 m/sec., and the mean kata-degree 36.4 H.
帯広畜産大学の論文
1953-03-30