Repeated exposures to cold and the relationship between skin and core temperatures in control of metabolic rate in the goat (Capra hircus).

1. After 10-12 experiments in each of three goats, in which skin or core temperatures were lowered while the other temperatures remained sufficiently high to prevent metabolic rate from increasing, the core temperature threshold of shivering was lowered by 0.35 degrees C. 2. After 10-15 experiments, in which skin and core temperatures were simultaneously lowered to induce major increases of metabolic rate, no further change of threshold was observed, while the slope of metabolic rate over core temperature was reduced. 3. It is concluded that repeated cold exposures without manifest shivering can induce tolerance adaptation to cold.