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In Australia and New Zealand an alternative method was developed for the short-term measurement of Methane Production Rate (MPR) of sheep using Portable Accumulation Chambers (PAC) during 1 hour without leading discomfort to the animals. Similarly to RC, CH4 emissions recorded in PAC include gases from flatulence in addition to eructed and expired CH4, but only during 1 hour. For a detailed comparison of the PAC and respiration chamber methods see Jonker et al. (2018).