Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/29253
Title: Enteric nitrous oxide emissions from beef cattle
Contributor(s): Parker, David B (author); Meyer, Beverly (author); Jennings, Tracy (author); Jennings, Jenny (author); Dougherty, Holland  (author)orcid ; Cole, N Andy (author); PAS (author); Casey, Ken (author)
Publication Date: 2018
DOI: 10.15232/pas.2018-01769
Handle Link: https://hdl.handle.net/1959.11/29253
Abstract: Nitrous oxide (N2O) is a greenhouse gas with a higher global warming potential than carbon dioxide (CO2) or methane (CH4). The objectives of this research were to quantify enteric N2O emissions from beef cattle and determine effects of dietary nitrate (NO3) concentrations. Experiments consisted of one in vitro incubation trial and 2 live animal (LA) trials. During the in vitro trial, gas was collected from 4 forage-based and 5 corn-based diets. During the LA trials, emissions were monitored from steers in respiration chambers. In LA trial 1, 5 measurements of 256 to 720 min were conducted on a single steer within a 48-h period. In LA trial 2, measurements were conducted on 4 steers in the absence of manure. Highest in vitro N2O production was from diets containing added NO3 or alfalfa. In vitro N2O increased with dietary NO3 concentrations (r2 = 0.99), with little correlation to dietary CP (r2 = 0.17). Added NO3 decreased CH4 emissions. Mean N2O emission rates (±SD) from the LA trials were 6.93 ± 2.99 mg of N2O∙kg−1 of DMI in trial 1 and 2.20 ± 0.10 mg of N2O∙kg−1 of DMI in trial 2. Mean enteric N2O emissions accounted for 0.35% (LA trial 1) and 0.12% (LA trial 2) of CO2 equivalents. Enteric N2O emission rates were 6 to 40 times lower than values cited in earlier publications. Enteric N2O emission rates were also 58 to 108 times lower than manure emissions. Therefore, efforts to reduce greenhouse gas emissions from beef cattle should focus on enteric CH4 and manure N2O as opposed to enteric N2O.
Publication Type: Journal Article
Source of Publication: The Professional Animal Scientist, 34(6), p. 594-607
Publisher: Elsevier Inc
Place of Publication: United States of America
ISSN: 1080-7446
Fields of Research (FoR) 2008: 050204 Environmental Impact Assessment
070203 Animal Management
Fields of Research (FoR) 2020: 410402 Environmental assessment and monitoring
300302 Animal management
Socio-Economic Objective (SEO) 2008: 830301 Beef Cattle
839802 Management of Greenhouse Gas Emissions from Animal Production
Socio-Economic Objective (SEO) 2020: 100401 Beef cattle
190302 Management of greenhouse gas emissions from animal production
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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