乳牛の採食時および絶食時の微量元素代謝に及ぼす環境温度の影響〔英文〕

概要

論文の詳細を見る
Four dry, non-pregnant Holstein cows were housed in two independently controled climatic rooms each housing two open-circuit respiration chambers. Two of the cows were exposed to temperatures in the order 18, 27, and 36°C and 60% RH, and the other two were exposed to the same temperatures in reverse order. The cows' trace element metabolism during fasting was measured 68-116h after food. Zinc, Cu, Se, and Co intake was marginally inadequate, but Fe, Mn, and Mo intake was almost adequate. Trace element excretion during fasting was affected by heat stress and tended to increase with temperature, although their excretion during feeding decreased at 36°C. Feces may be a major pathway of trace element excretion during feeding and fasting in cattle, since fecal excretion during feeding and fasting was significantly higher than urinary excretion. Results suggest that trace element requirements for maintenance may be affected by heat stress and increase with increasing temperatures above 27°C
社団法人日本畜産学会の論文