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Emissions of Ammonia and Greenhouse Gases from Two Naturally Ventilated Barns for Dairy Cows

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-0934.(doi:10.13031/2013.41540)
Authors:   Wentao Wu, Guoqiang Zhang, Chao Zong
Keywords:   Slatted floor; temperature; methane; air exchange rate

Emissions of ammonia to the atmosphere cause acidification of soil and increase eutrophication to aquatic systems, while greenhouse gases influence the global climate. To achieve further knowledge on emissions of naturally ventilated livestock buildings and fulfil the obligations to reduce emissions required in the international conventions, an inventory on emission of NH3, CH4, CO2 and N2O was conducted in two naturally ventilated dairy cattle buildings during three periods including winter and summer time. Building 1 has solid floors with scrapers. Building 2 has slatted floor with a robotic scraper to continuously remove manure to pit. Concentration of gases, air velocities and temperature were recorded inside and outside the buildings. The results showed that high NH3 concentration was found in the warmer period in building 1. NH3 concentration stayed in the same level for both cold and warm period in building 2. Low concentration of N2O was measured outside and inside the buildings; the difference of the concentrations were also very low. The air exchange rate was more fluctuated and higher in building 1 than that in building 2. Uncertainties remaining for CO2 production model could arise during the fixed milking time. The NH3 emission rates varied from 0.032-0.077 kg HPU-1 d-1 in building 1 and varied from 0.018-0.030 kg HPU-1 d-1 in building 2. The overall variation of the ammonia emission rate followed the change of the outside wind speed; the influence of temperature on the ammonia emission rate was also observed in this study.

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