Abstract
There have been conflicting reports about the existence of non-shivering thermogenesis in the newborn calf of domestic cattle. The present experiments show that intravenous infusion of noradrenaline (1 μg·kg<sup>––</sup><sup>1</sup>·min<sup>––1</sup>) causes a large increase in the temperature of perirenal adipose tissue, and a smaller increase in mixed-venous-blood temperature of calves. The animal’s total oxygen consumption increases and respiratory quotient decreases. On the first day of life the noradrenaline produces a large temperature difference between adipose tissue and blood, and a large increase in total oxygen consumption. This response disappears with age, with great variation between individual animals.
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