Ammonia and Methane Emission Factors from Cattle Operations Expressed as Losses of Dietary Nutrients or Energy

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dc.contributor.author Liu, Zifei
dc.contributor.author Liu, Yang
dc.contributor.author Murphy, James P.
dc.contributor.author Maghirang, Ronaldo
dc.date.accessioned 2017-05-10T20:48:30Z
dc.date.available 2017-05-10T20:48:30Z
dc.date.issued 2017-02-23
dc.identifier.uri http://hdl.handle.net/2097/35577
dc.description Citation: Liu, Z.; Liu, Y.; Murphy, J.P.; Maghirang, R. Ammonia and Methane Emission Factors from Cattle Operations Expressed as Losses of Dietary Nutrients or Energy. Agriculture 2017, 7, 16.
dc.description.abstract The objective of this study was to conduct a systematic review of published literature on ammonia (NH3) and enteric methane (CH4) emissions from beef and dairy cattle operations to obtain statistically representative emission factors based on dietary intakes of nutrients or energy, and to identify major causes of emission variations. NH3emissions from lagoon or other manure storage facilities were not included in this review. The NH3 and CH4 emission rates, expressed as a percentage losses of dietary nutrients or energy, demonstrated much less variation compared with emission rates expressed in g/animal/day. Air temperature and dietary crude protein (CP) content were identified as two major factors that can affect NH3 emission rates in addition to farm type. Feed digestibility and energy intake were identified as two major factors that can affect CH4 emission rates expressed as a percentage losses of dietary energy. Generally, increasing productivity and feed efficiency represented the greatest opportunity for mitigating NH3 or CH4 emissions per unit of livestock product. Expressing CH4loss on a digestible energy basis rather than a gross energy intake basis can better represent the large variation among diets and the effects of varying dietary emission mitigation strategies.
dc.relation.uri https://doi.org/10.3390/agriculture7030016
dc.rights Attribution 4.0 International (CC BY 4.0)
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject Crude Protein Content
dc.subject Feeding Efficiency
dc.subject Nitrogen
dc.subject Forage-to-Concentrate Ratio
dc.subject Digestibility
dc.subject Digestible Energy
dc.title Ammonia and Methane Emission Factors from Cattle Operations Expressed as Losses of Dietary Nutrients or Energy
dc.type Article
dc.date.published 2017
dc.citation.doi 10.3390/agriculture7030016
dc.citation.issn 2077-0472
dc.citation.issue 3
dc.citation.jtitle Agriculture 
dc.citation.volume 7
dc.contributor.authoreid Zifeiliu
dc.contributor.authoreid yliu16
dc.contributor.authoreid jmurphy
dc.contributor.authoreid rmaghir
dc.contributor.kstate Liu, Zifei
dc.contributor.kstate Liu, Yang
dc.contributor.kstate Murphy, James P.
dc.contributor.kstate Maghirang, Ronaldo


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Attribution 4.0 International (CC BY 4.0) Except where otherwise noted, the use of this item is bound by the following: Attribution 4.0 International (CC BY 4.0)

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