乾乳牛の第一胃内揮発性脂肪酸濃度と熱発生量との関係に及ぼす環境温度の影響

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タイトル別名
  • The Effect of Environmental Temperature on the Relationship between Ruminal Volatile Fatty Acids and Heat Production of Dry Cows
  • カンニュウギュウ ノ ダイイチ イナイ キハツセイ シボウサン ノウド ト ネ

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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 on the relationship between ruminal VFA and heat production or body temperature 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: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 8:30 AM and 5:30 PM. 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) The concentrations of total VFA, acetic acid and propionic acid were significantly higher in HS treatment than in both HR and LR treatments. 2) Total VFA declined at a slower rate with time after feeding in HS treatment. 3) The peaking time for the total VFA was about 2 or 3hr after feeding whereas for the heat production it was about 5hr after feeding. 4) All components of VFA had high positive correlations each other in both H and L treatments. 5) Heat production had a high positive correlation with all components of VFA in both H and L treatments. 6) Body temperature had a positive correlation with heat production and all components of VFA in H treatment whereas in L treatment significant correlation was not found. 7) Results from multiple regression analysis suggested that there is a possibility that differences in the composition of the ruminal VFA produced by fermentation of different types of ration could decrease the body temperature of cow in a hot environment.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 50 (5), 265-270, 1979

    公益社団法人 日本畜産学会

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