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Construction and Operation of an Open-Circuit Indirect Calorimetry System for Small Ruminants¹

Washington State University, Pullman 99164-6320

Abstract

An open-circuit indirect respiration calorimetry system for the collection of long-term metabolic heat production data for medium and small animals is described. The system is designed for use with small ruminants, but it has the capacity for measuring heat production in nonruminant species up to 150 kg. The system consists of an internal climatic control system, air flow control and volume measuring system, and gas analyzers for O₂, CO₂ and CH₄. Carbon dioxide recovery checks of the four chambers produced recovery values ranging from 96.73 to 100.89%. The actual mean fasting heat production measured for 12 wether sheep was 63.13 kcal/kg^.75 ± .83. The total estimated cost of four chambers and the associated instrumentation was less than $17,000 in 1984.

¹ Scientific Paper No. 7690. Agric. Res. Center, College of Agric. and Home Econ., Washington State Univ. Project 0437.

² Present address: Div. of Agric., Arizona State Univ., Tempe 85287.

³ Present address: Div. of Anim. and Vet. Sci., West Virginia Univ., Morgantown 26506.