| Autor: |
Eileen F. Wheeler, M. A. A. Adviento-Borbe, Patrick A. Topper, N. E. Brown, Gabriella A. Varga |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
2008 Providence, Rhode Island, June 29 - July 2, 2008. |
| DOI: |
10.13031/2013.24649 |
| Popis: |
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 (CO2), methane (CH4) and nitrous oxide (N2O)]. 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 d-1) = 1.7 + 0.12*Tair (oC) [R2=0.80] for indoor air temperatures (Tair) over the range of -5 to 32oC (1AU = 500 kg). Ammonia, CO2 and CH4 gas emissions were controlled to some extent by microbial activity and similar environmental factors. N2O fluxes remained |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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