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Emissions of Greenhouse Gases from Naturally Ventilated Free-Stall Dairy Barns

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

Citation:  Paper number  131593425,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131593425) @2013
Authors:   Hung-Soo Joo, Pius M Ndegwa, Albert J Heber, Jiqin Ni, Bill W Bogan, Juan C. Ramirez-Dorronsoro, Erin W Cortus
Keywords:   Ventilation rates, dairy manure, carbon dioxide, methane, nitrous oxide.

Abstract. Greenhouse gases (GHG) emissions from two naturally-ventilated free-stall dairy barns were measured during a three-month study period (May, July and September, 2009). Barn 1 (B1) housed 400 fresh cows, while Barn 2 (B2) housed 850 lactating cows. Air samples at inlet and outlet of the barns for measurement of GHG (CO2, N2O, and CH4) concentrations were delivered to a photoacoustic gas analyzer (INNOVA model 1412) using a custom-made gas sampling system. Ventilation rates in the barns were determined using three dimensional ultrasonic anemometers mounted on air inlets and outlets. Emissions of CO2 averaged 23.14 in B1 and 18.53kg-CO2/cow/d in B2, respectively. Emissions of CH4 averaged 326.5 in B1 and 374.5 g-CH4/cow/d in B2. The respective emissions of N2O in B1 and B2 were 16.00 and 7.86 g-N2O/cow/d. Emissions of CO2 and CH4 in both barns, in particular, were similar. Emissions of N2O from the two barns, however, were significantly different probably because of manure management differences. One half of B1 consisted of an open dirt floor (no stalls) and manure (urine plus feces) deposited on this dirt was thus rarely removed and resulted in significantly higher emissions of N2O from this barn (B1). Conversely, the correlation between CO2 and N2O was considerably higher than that between CO2 and CH4 emissions (R2 ranged from 0.82 to 0.98).

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