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Mitigating greenhouse gas and ammonia emissions from beef cattle feedlot production - A system meta-analysis Yue Wang, Xinrong Li, Jinfeng Yang, Zhuang Tian, Qinping Sun, Wentao Xue, and Hongmin Dong Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.8b02475 • Publication Date (Web): 17 Aug 2018 Downloaded from http://pubs.acs.org on August 19, 2018

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Environmental Science & Technology

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Mitigating greenhouse gas and ammonia emissions from beef cattle feedlot production A system meta-analysis

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Yue Wang∇, Xinrong Li∇, Jinfeng Yang∇, Zhuang Tian∇, Qinping Sun∇, Wentao Xue∇,

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Hongmin Dong#∗

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Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China;

Institute of Environment and Sustainable Development in Agriculture, Chinese

Academy of Agricultural Sciences, Beijing 100081, China

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KEYWORDS. beef cattle feedlot, enteric fermentation, manure management, GHG,

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NH3, mitigation

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ABSTRACT: Beef cattle production systems are the largest contributors of

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greenhouse gas (GHG) and ammonia (NH3) emissions in the livestock industry. Here,

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we present the first meta-analysis and integrated assessment of gaseous emissions and

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mitigation potentials for a typical beef cattle feedlot system, including methane (CH4),

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nitrous oxide (N2O), and NH3 losses from enteric fermentation and manure

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management based on data from 104 studies. Fourteen integrated emission factors (EF)

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and the mitigation efficiencies (ME) of 17 available options were provided. The

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estimated GHG and NH3 emissions from the baseline feedlot system were 2786 ±108 1

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kg carbon dioxide equivalents (CO2-eq) per animal unit (AU) per year and 49.1 ±1.5 kg

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NH3 AU-1 yr-1, respectively. Enteric CH4 fermentation and manure on the feedlot

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contributed 67.5% and 80.8% of the total system GHG and NH3 emissions,

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respectively. The highest ME values were found for lipid additives for enteric CH4

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fermentation and urease inhibitor additives (UI) for NH3 emissions from manure on

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the feedlot being -14.9% (p