Abstract
An open-circuit indirect calorimetry ventilated hood system for cattle nourished by intragastric infusion of nutrients is described. The system consisted of an enclosed animal stall, a vortex flow meter and gas analysers for oxygen and carbon dioxide. The actual mean fasting heat production in three Friesian steers was 365 ± 3 kJ kg W −0.75 day −1. The system has been successfully used for measuring the energy costs of eating, rumination and standing in cattle.
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