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Strategies to Reduce Methane Emissions from Enteric and Lagoon Sources

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Strategies to Reduce Methane Emissions from Enteric and Lagoon Sources STRATEGIES TO REDUCE METHANE EMISSIONS FROM ENTERIC AND LAGOON SOURCES (Contract 17RD018) Prepared for: State of California Air Resources Board Research Division PO Box 2815 Sacramento CA 95812 Prepared by: Ermias Kebreab and Xiaoyu Feng University of California, Davis, One Shields Avenue Davis, CA 90210 (530) 752 5907 January 8, 2021 1 DISCLAIMER The statements and conclusions in this report are those of the contractor and not necessarily those of the California Air Resources Board. The mention of commercial products, their source, or their use in connection with material reported herein is not to be construed as actual or implied endorsement of such products. 2 ACKNOWLEDGEMENTS This study was supported by the California Air Resources Board Project #17RD018. The authors want to thank the GLOBAL NETWORK project for providing access to their Treatment Means Methane Mitigation Database. The GLOBAL NETWORK project was coordinated by the Feed and Nutrition Network, which is part of the Livestock Research Group of the Global Research Alliance for Agricultural Greenhouse Gases (https://globalresearchalliance.org/research/livestock/collaborative-activities/global-research- project). 3 TABLE OF CONTENTS Acknowledgments ..........................................................................................................................3 Table of Contents ...........................................................................................................................4 List of Abbreviations .....................................................................................................................6 Abstract ...........................................................................................................................................7 Executive Summary .......................................................................................................................9 Introduction ..................................................................................................................................12 Feed additives targeting enteric methane emissions .................................................................14 Feed additives with some potential for mitigation .....................................................................18 Secondary plant compounds ......................................................................................................... 18 Methanogenesis inhibitors ............................................................................................................ 19 Feed additives with highest potential for mitigation ..................................................................19 3-Nitrooxypropanol........................................................................................................................ 20 Nitrates .......................................................................................................................................... 24 Additives targeting manure methane emissions........................................................................38 Data collection and selection ......................................................................................................... 39 Statistical analysis .......................................................................................................................... 40 Effect sizes of manure additives .................................................................................................... 42 Effects of manure additives from random-effects models ............................................................ 47 Heterogeneity test ......................................................................................................................... 49 Analysis of manure type, additive type, and characteristic of treatment manure ....................... 50 Net reductions in greenhouse gases from feed additives in California ...................................54 Materials and methods .................................................................................................................. 54 Mitigation scenarios ...................................................................................................................... 55 Emission associated with production and use of additives ........................................................... 56 3-Nitrooxypropanol........................................................................................................................ 56 Nitrate ............................................................................................................................................ 60 Results and Discussion ................................................................................................................... 61 3-Nitrooxypropanol........................................................................................................................ 61 Nitrate ............................................................................................................................................ 63 4 Comparison of 3-nitrooxypropanol and nitrate additives ............................................................ 65 Summary .......................................................................................................................................67 References .....................................................................................................................................69 Appendix 1 ....................................................................................................................................87 Appendix 2 ....................................................................................................................................92 5 List of Abbreviations 3NOP 3-nitrooxypropanol BW Body weight CARB California Air Resources Board CDFA California Department of Food and Agriculture CP Crude protein (% dry matter) DDGS Dry distillers grain with solubles DMI Dry matter intake (kg/d) ECM Energy corrected milk GE Gross energy GHG Greenhouse gases IPCC Intergovernmental Panel for Climate Change LCA Life cycle assessment MD Mean difference NDF Neutral detergent fiber (% dry matter) OM Organic matter) RMD Relative mean difference RVE robust variance estimation SMD Standardized mean difference USDA United States Department of Agriculture USDA NASS United States Department of Agriculture National Agricultural Statistics Service USDA ERS United States Department of Agriculture Economic Research Service 6 ABSTRACT The State of California launched the short-lived climate pollutant reduction strategy (SB 1383) with the objective of decreasing methane (CH4) emissions from livestock by 40% by 2030 from 2013 levels. Considering about 50% of CH4 emissions in the State are attributed to enteric fermentation and manure, achieving significant CH4 emission reduction from these sources will be critical to meeting SB1383 goals. There are numerous mitigation options described in the literature including feed and manure additives. The objective of the study was to provide quantitative analysis, evaluate feasibility, and summarize and prioritize research gaps to guide future research in the State. Specifically the current study conducted a literature review of available mitigation strategies using additives to reduce enteric and manure methane emissions including size effect and performance analyses and used life-cycle assessment tools to estimate net greenhouse gas emissions from using potential feed additives in the dairy industry. Effect size and meta-analyses were conducted to identify the additives with greatest potential for CH4 mitigation. For feed additives, 3-nitrooxypropanol (3NOP), bromochloromethane, chestnut, coconut, distillers dried grains and solubles, eugenol, grape pomace, linseed, monensin, nitrate, nitroethane, saifoin, fumaric acid, and tannins had significant impacts on enteric emissions. For manure additives, acidification, biochar, microbial digestion, physical agents, straw, and other chemicals significantly reduced CH4 emissions. However, there were other promising additives that need further research, including Mootral, macroalgae and SOP lagoon additive (SOP). After further analysis of variance, the most effective feed additives were 3NOP (41% in dairy and 22% reduction in beef) and nitrate (14.4% reduction). Biochar as a manure additive can be effective on compost manure (up to 82.4% reduction), but may have no impact on lagoon emissions. A life cycle assessment tool was used to estimate the net reduction in enteric CH4 emissions by 7 using the feed additives 3NOP and nitrate. The overall average net reduction rate of supplementing 3NOP and nitrate were 11.7% and 4.9%, respectively. Given the toxicity concerns of nitrate, only 3NOP is recommended for use pending FDA approval. Considering California milk production of 18 billion kg in 2017, using nitrate on California dairy cows would reduce GHG emissions 1.09 billion kg CO2e and 3NOP 2.33 billion kg CO2e annually. Further research in the additives of Mootral, macroalage, SOP, biochar and other emerging ones is required before recommendation for use can be made. 8 EXECUTIVE SUMMARY Background About 50% of CH4 emissions in California are attributed to enteric fermentation and manure; therefore, achieving significant methane (CH4) emission reduction from these sources will be critical to meeting SB1383 goals. There are several strategies for reducing CH4
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