TY - GEN
T1 - Ammonia and greenhouse gas emissions from dairy freestall barn manure
AU - Wheeler, Eileen Fabian
AU - Adviento-Borbe, M. Arlene
AU - Topper, Patrick A.
AU - Brown, Neil E.
AU - Varga, Gabriella
PY - 2008/1/1
Y1 - 2008/1/1
N2 - Lactating cow trials were conducted to evaluate the impact of precision-fed diets at 16.5% crude protein but differing in silage source (alfalfa-corn vs. grass-corn or all-corn) and corn grain grind (fine vs. coarse) on emissions of ammonia (NH3), and greenhouse gases (GHG) [carbon dioxide (CO 2), methane (CH4) and nitrous oxide (N20)]. Manure on the 120-cow freestall barn floor with gas fluxes measured at 80 locations over a 12-hour period using a non-steady-state flux chamber and an infrared photoacoustic gas analyzer during 18 trial days over a 6-month period. Air and manure temperatures were positively and highly correlated with emissions of NH3, CO2 and CH4 NH3 (g AU 1 d1) = 1.7 + 0.12*Tair (°C) [R 2=0.80] for indoor air temperatures (Tair) over the range of-5 to 32°C (1AU = 500 kg). Ammonia, CO2 and CH4 gas emissions were controlled to some extent by microbial activity and similar environmental factors. N2O fluxes remained <0.1 g AU1 d1. All gas fluxes were similar (p=0.054 to 0.860) regardless of silage source and corn grind. Highest average NH3 and CH4 fluxes were measured in the all-corn silage diet (also coincided with the higher environment temperature trials) with 6.3 g ALT1 d1 for NH3 and 3.5 g AU1 d1 for CH4. The alfalfa-corn diet had the highest average C02 emissions (111 g AU1 d1).
AB - Lactating cow trials were conducted to evaluate the impact of precision-fed diets at 16.5% crude protein but differing in silage source (alfalfa-corn vs. grass-corn or all-corn) and corn grain grind (fine vs. coarse) on emissions of ammonia (NH3), and greenhouse gases (GHG) [carbon dioxide (CO 2), methane (CH4) and nitrous oxide (N20)]. Manure on the 120-cow freestall barn floor with gas fluxes measured at 80 locations over a 12-hour period using a non-steady-state flux chamber and an infrared photoacoustic gas analyzer during 18 trial days over a 6-month period. Air and manure temperatures were positively and highly correlated with emissions of NH3, CO2 and CH4 NH3 (g AU 1 d1) = 1.7 + 0.12*Tair (°C) [R 2=0.80] for indoor air temperatures (Tair) over the range of-5 to 32°C (1AU = 500 kg). Ammonia, CO2 and CH4 gas emissions were controlled to some extent by microbial activity and similar environmental factors. N2O fluxes remained <0.1 g AU1 d1. All gas fluxes were similar (p=0.054 to 0.860) regardless of silage source and corn grind. Highest average NH3 and CH4 fluxes were measured in the all-corn silage diet (also coincided with the higher environment temperature trials) with 6.3 g ALT1 d1 for NH3 and 3.5 g AU1 d1 for CH4. The alfalfa-corn diet had the highest average C02 emissions (111 g AU1 d1).
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M3 - Conference contribution
AN - SCOPUS:63049089061
SN - 9781605605364
T3 - American Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
SP - 4552
EP - 4566
BT - American Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
PB - American Society of Agricultural and Biological Engineers
T2 - American Society of Agricultural and Biological Engineers Annual International Meeting 2008
Y2 - 29 June 2008 through 2 July 2008
ER -