乾乳牛の熱発生量,各種生理反応に及ぼす環境温度ならびに乾草摂取量の影響

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  • The Effect of Environmental Temperature and Level of Hay Intake on the Heat Production and Some Physiological Responses of Dry Cows
  • カンニュウギュウ ノ ネツ ハッセイリョウ カクシュ セイリ ハンノウ ニ オ

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This trial was carried out, utilizing four fistulated Holstein dry cows in a 4×4 Latin-square design with 14-day periods, to investigate the effect of environmental temperature and level of hay intake on the heat production and some physiological responses of cows. The cows were housed in two climatic chambers and fed one of two levels of Italian ryegrass hay under two temperature-relative humidity (RH) treatments of 32°C-60% RH (H) and 18°C-60% RH (L). One level of hay intake was the maintenance requirement of The Japanese Feeding Standard (S) and the other level was 70% of the S level (R). The four treatment combinations were HS, LS, HR and LR. The cows were fed the hay twice daily in equal amount at 8.30AM and 5.30PM. Any hay refused by these cows during the trial was weighed back and inserted into the rumen through the fistula. The results were as follows: 1) Body temperature was significantly higher in HS treatment than in the other three treatments. 2) Pulse rates were influenced by the level of hay intake, being higher at S level than at R level. 3) Significant correlations were found between the heat production and the pulse rate of the individual cow. 4) High temperature remarkably changed the respiratory activity, increased the respiration rate and decreased the tidal volume. 5) The heat production was about 10% higher at H treatment than at L treatment, and significantly higher at S level than at R level. 6) A significant difference in heat production was observed between HS and both HR and LR, and between LS and LR. 7) The higher critical temperature of Holstein dry cows seemed to exist between 29°C and 32°C.

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  • 日本畜産学会報

    日本畜産学会報 48 (10), 509-514, 1977

    公益社団法人 日本畜産学会

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