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Feed intake levels, physiological response and plasma substrate concentration were measured to assess the effect of heat on substrate metabolism during physiological acclimation for heat balance over a three-day period of heat exposure and/or feed reduction in laying hens. 1) Decreased daily feed intake on the 1st day of heat exposure assumed a definite level on the 3rd day of heat exposure. 2) Body temperature and respiration rate attained maximum levels on the 1st day of heat exposure, and then steadily declined during heat exposure. Heart rate was slightly low during heat exposure. 3) Plasma concentrations of uric acid, cholesterol ester, phospholipid and β-lipoprotein showed low levels during heat exposure and/or even following heat exposure. The decrease in these concentrations appeared higher during heat exposure than feed reduction. Thus possibly, changes in plasma lipid and/or protein metabolism due to heat, regardless of reduction in feed intake, may accompany physiological acclimation for heat balance during a period of heat exposure. Jpn. J. Zootech. Sci., 61 (8): 707-713, 1990

Effects of Short Term Heat Exposure on Physiological Response and Plasma Substrate Concentration in Laying Hens