Full adoption of the most effective strategies to mitigate methane emissions by ruminants can help meet the 1.5 °C target by 2030 but not 2050

Arndt, Claudia; Hristov, A.N.; Price, William J.; McClelland, Shelby C.; Pelaez, A.M.; Cueva, S.F.; Oh, J.; Dijkstra, J.; Bannink, A.; Bayat, Ali; Crompton, L.A.; Eugène, Maguy; Enahoro, Dolapo K.; Kebreab, E.; Kreuzer, Michael; McGee, M.; Martin, Cécile; Newbold, C. J.; Reynolds, C.K.; Schwarm, Angela; Shingfield, Kevin J.; Veneman, Jolien B.; Yáñez-Ruíz, D. R.; Yu, Zhongtang

doi:10.1073/pnas.2111294119

Cited by 144 publications

(113 citation statements)

References 64 publications

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“…A detailed description of the methods and results of the meta-analysis discussed here can be found in Arndt et al (2022). Briefly, the database used for the analysis included treatment means from in vivo stud-ies published from 1964 to 2018.…”

Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

“…Daily CH 4 emissions were analyzed in 783 mean comparisons, yCH 4 in 598, and iCH 4 in 260. The analysis also examined the effect of mitigation strategies on DMI, milk production (or daily gain), and total-tract NDF digestibility but these results are not discussed here (see Arndt et al, 2022). Analyses were run across all ruminant species and included main mitigation strategies and their respective subcategories as potential moderator fixed effects.…”

Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

“…Analyses were run across all ruminant species and included main mitigation strategies and their respective subcategories as potential moderator fixed effects. Details on the statistical procedures can be found in Arndt et al (2022).…”

Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

“…Methane inhibitors (3-NOP and bromochloromethane) had the largest CH 4 mitigation effect (Table 1) and had no effect on DMI, fiber digestibility, milk production, or ADG. Since 2018 [the last year that data were included in the Arndt et al (2022) database], new data from 3-NOP experiments with beef and dairy cattle have been published but were not reflected in the Arndt et al (2022) analysis. An extensive study on a commercial feedlot in Alberta, Canada, for example, reported a 26% decrease in CH 4 emissions and a slight (nonsignificant) decrease in DMI, which resulted in a trend for increased feed efficiency in beef cattle fed a backgrounding diet (Alemu et al, 2021).…”

Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

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Symposium review: Effective nutritional strategies to mitigate enteric methane in dairy cattle

Hristov

Melgar

Wasson

et al. 2022

Journal of Dairy Science

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Intensive research in the past decade has resulted in a better understanding of factors driving enteric methane (CH 4 ) emissions in ruminants. Meta-analyses of large databases, developed through the GLOBAL NET-WORK project, have identified successful strategies for mitigation of CH 4 emissions. Methane inhibitors, alternative electron sinks, vegetable oils and oilseeds, and tanniferous forages are among the recommended strategies for mitigating CH 4 emissions from dairy and beef cattle and small ruminants. These strategies were also effective in decreasing CH 4 emissions yield and intensity. However, a higher inclusion rate of oils may negatively affect feed intake, rumen function, and animal performance, specifically milk components in dairy cows. In the case of nitrates (electron sinks), concerns with animal health may be impeding their adoption in practice, and potential emission trade-offs have to be considered. Tannins and tanniferous forages may have a negative effect on nutrient digestibility, and more research is needed to confirm their effects on overall animal performance in long-term experiments with high-producing animals. A meta-analysis of studies with dairy cows fed the CH 4 inhibitor 3-nitrooxypropanol (3-NOP) at the Pennsylvania State University showed (1) a consistent 28 to 32% decrease in daily CH 4 emissions or emissions yield and intensity; (2) no effect on dry matter intake, milk production, body weight, or body weight change, and a slight increase in milk fat concentration and yield (0.19 percentage units and 90 g/d, respectively); 3-NOP also appears to increase milk urea nitrogen concentration; (3) an exponential decrease in the mitigation effect of the inhibitor with increasing its dose (from 40 to 200 mg/kg of feed dry matter, corresponding to 3-NOP intake of 1 to 4.8 g/ cow per day); and (4) a potential decrease in the efficacy of 3-NOP over time, which needs to be further investigated in long-term, full-lactation or multiple-lactation studies. The red macroalga Asparagopsis taxiformis has a strong CH 4 mitigation effect, but studies are needed to determine its feasibility, long-term efficacy, and effects on animal production and health. We concluded that widespread adoption of mitigation strategies with proven effectiveness by the livestock industries will depend on cost, government policies and incentives, and willingness of consumers to pay a higher price for animal products with decreased carbon footprint.

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Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

Section: A Review Of the Arndt Et Al (2021) Meta-analysismentioning

confidence: 99%

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Symposium review: Effective nutritional strategies to mitigate enteric methane in dairy cattle

Hristov

Melgar

Wasson

et al. 2022

Journal of Dairy Science

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“…Many articles reviewed the scientific literature on enteric methane mitigation options (Hristov et al, 2013a;Knapp et al, 2014;Negussie et al, 2017;Beauchemin et al, 2020;Lassen and Difford, 2020). Arndt et al (2022) recently conducted a meta-analysis to examine 98 enteric methane mitigation options from a comprehensive data set of treatment means from 425 peer-reviewed studies published between 1963 and 2018. They found that most of the options (63 out of 98, or 64%) were not successful in mitigating enteric methane.…”

Section: Introductionmentioning

confidence: 99%

Symposium review: Development of a funding program to support research on enteric methane mitigation from ruminants

Tricárico

Haas

Hristov

et al. 2022

Journal of Dairy Science

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Enteric methane is a major source of greenhouse gas emissions from milk production systems. Two organizations based in the United States, the Foundation for Food and Agriculture Research and the Dairy Research Institute, have developed a collaborative program to align resources and fund projects to identify, develop, and validate new and existing mitigation options for enteric methane emissions from dairy and beef cattle. This collaborative program is called the Greener Cattle Initiative. The program will develop requests for proposals and award grants on projects that address challenges within, but not limited, to the following research areas: dairy and beef cattle nutrition, rumen microbiome, dairy and beef cattle genetics, sensing and data technology for enteric methane measurement and prediction, and socioeconomic analysis of enteric methane mitigation practices. The program is structured as a consortium with closed participation and a flat governance collaboration model. The Greener Cattle Initiative program will continue incorporating participants from the food and agriculture industry, commodity groups, and nonprofit organizations who share common objectives and contribute in-kind and matching funds to the program, up to a total of 10 organizations. Research findings will be communicated broadly, after a waiting period for exclusive access to program participants, to create shared knowledge on enteric methane mitigation. The Greener Cattle Initiative is expected to award up to $5 million in research grant funding in a 5-year period, which will contribute to advancing the voluntary greenhouse gas reduction goals established by both the United States and global dairy sectors.

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Effect of buffer pH on methane production and fermentation characteristics of three forages tested in vitro

Della Rosa,

Jonker,

Janssen

et al. 2024

J Sci Food Agric

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BACKGROUNDLow rumen pH is proposed to be a major mechanism for low methane (CH4) emissions from sheep fed forage rape. However, it is difficult to separate this from other in vivo factors, such as rumen passage rate. The objective of this study was to determine the effect of pH alone on CH4 production in vitro using different pH buffers. Ryegrass, white clover and forage rape were incubated in vitro using three different incubation buffers with starting pH values of 5.5, 6.2 and 6.8.RESULTSDecreasing pH reduced overall in vitro CH4 emission relative to fermented hexoses (CH4/FHex) by up to 54% and overall fermentation by 40%. pH also changed fermentation profiles where the acetate + butyrate to propionate + valerate ratio decreased when pH decreased. Within the three forages, forage rape led to the lowest CH4/FHex, but only in pH 5.5 and 6.2 buffer, and this was enhanced when the pH fell below 6.CONCLUSIONReducing pH in vitro decreased CH4 production and overall fermentation across all forages. The lower pH reached by forage rape compared to ryegrass and white clover appears to drive the lower CH4 production relative to the extent of fermentation from forage rape compared to the other forages. © 2024 The Author(s). Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Full adoption of the most effective strategies to mitigate methane emissions by ruminants can help meet the 1.5 °C target by 2030 but not 2050

Cited by 144 publications

References 64 publications

Symposium review: Effective nutritional strategies to mitigate enteric methane in dairy cattle

Symposium review: Effective nutritional strategies to mitigate enteric methane in dairy cattle

Symposium review: Development of a funding program to support research on enteric methane mitigation from ruminants

Effect of buffer pH on methane production and fermentation characteristics of three forages tested in vitro

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