Abstract
1. 1. Patterns of ear temperatures were examined in 2- to 45-day-old calves. 2. 2. At variable heat loads, peripheral temperature levels varied with the heat load with little fluctuations. 3. 3. When 2 to 3 days old, high ear temperatures were maintained for 10–14 hr/day at 10–15°C ambient temperatures in 5 of 8 calves. 4. 4. In near-natural conditions, fluctuating ear temperatures were the rule in the vasodilated, intermediate and vasoconstricted states; fluctuations were symmetrical in the two ears in the vasodilated and intermediate states only. 5. 5. The possible occurrence of cold-induced vasodilation at 10–20°C ambient temperature is discussed.
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