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Assessment of the Sulfur Hexafluoride (SF₆) Tracer Technique for Measuring Enteric Methane Emissions from Cattle

^a Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
^b Agriculture and Agri-Food Canada, Swift Current, SK, Canada S9H 3X2

View larger version (17K): [in a new window]   Fig. 1. Schematic diagram of the chamber used to measure methane emissions. The insert shows the vertical cross-section of the rubber flap sealing the chamber air from the manure removal track.

View larger version (11K): [in a new window]   Fig. 2. Comparison of methane emissions using the chamber and sulfur hexafluoride (SF6) tracer techniques. The correlation coefficient was 0.81 indicating moderate deviation of the data set from the best-fit linear line. The concordance coefficient was 0.79 indicating agreement between the two techniques (i.e., close to a 1:1 fit).