1a. Objectives (from AD-416):
Measure ammonia, methane, and carbon dioxide concentration in air emitted from deep-bedded monoslope cattle facilities over a 3-year period.
1b. Approach (from AD-416):
Two commercial deep-bedded monoslope cattle barns in NW Iowa will be used for this 3-year monitoring study. In each barn, instrumentation will be set up in two pens for continuous monitoring of ammonia, carbon dioxide, and methane using the 1412 INNOVA photoacoustic gas monitor (n=4 pens). Ammonia, carbon dioxide, and methane concentration of air will be measured at an inlet point on the south side of each pen. Ammonia, carbon dioxide, and methane concentrations will also be measured from air samples collected at three sampling points approximately 3 meters above the feedlot surface on the north side of each pen (n=8 locations/barn). Air samples will be monitored continuously for 1 month at the first barn. The equipment will then be moved to two pens in the second barn and the process repeated for one month. There will then be one month when no samples will be collected during which time equipment repair/maintenance will occur and the INNOVA can be used for other research projects. The 2 month monitoring cycle will be repeated during each of the four seasons for a total of 8 months of data collection per year. Scientists from South Dakota State University will use the same methodology to collect data from two additional cattle deep bedded barns. The data will be combined with ARS data and published together.
3. Progress Report:
Two beef barns in Iowa were instrumented with air quality sampling equipment and weather stations. Air quality data were collected continuously for 2 years, ending in Oct. 2012. The first-ever database of ammonia, hydrogen sulfide, greenhouse gases, and particulate matter from cattle deep-bedded monoslope facilities was collected. Data is currently being analyzed but preliminary results demonstrate that differences exist in particulate matter concentration between cattle deep-bedded monoslope barns and reported values for open lot feedlots. Ammonia, hydrogen sulfide, and greenhouse gases vary across seasons and bedding management styles among cattle deep-bedded monoslope facilities. Scientists from ARS in Clay Center, Nebraska and South Dakota State University have presented partial results at the Waste to Worth Conference in April 2013. Two webinars hosted by the Livestock Poultry Environmental Learning Center were held, one in May 2013 and one in July 2013 to report partial results of the two-year study. Cattle producers will be able to use this data to make management changes to their facilities to reduce barn emissions and improve air quality in the facility.