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Emission rates of CH4, N2O and NH3 were measured in a commercial free-stall barn that housed 141 lactating dairy cows, and 75 dry cows and replacement heifers. Animal activity, measured using the ALPRO™ dairy herd management system was used together with the CO2 balance method to calculate the ventilation rate. Methane emission was also modelled using the IPCC Tier 2 method. Animal activity variations...
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