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Emission factors from enteric fermentation of different categories of cattle in the Mexican tropics: a comparison between 2006 and 2019 IPCC

Author

Listed:
  • Adriana Rivera-Huerta

    (Universidad Nacional Autónoma de México)

  • María Salud Rubio Lozano

    (Universidad Nacional Autónoma de México)

  • Juan C. Ku-Vera

    (Universidad Autónoma de Yucatán)

  • Leonor Patricia Güereca

    (Universidad Nacional Autónoma de México)

Abstract

Considerable interest has been shown in evaluating methodologies to calculate current enteric methane emissions and using those that produce the most precise results. The objectives of this study were (1) to calculate the emission factors (EFs) for enteric methane produced by different livestock systems in the Mexican tropics using the Tier-2 methodology of the 2006 IPCC and 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories (2019 IPCC); (2) to calculate the Tier-2 EFs using both IPCC versions with the methane conversion factor (Ym) estimated with emission data specific to the Mexican tropics (denoted as Tier-2MX), and (3) to compare the EFs from (2) and (1) based on the Ym specific to the Mexican tropics and the default Ym for the 2006 and 2019 IPCC, respectively. To calculate the EFs and Ym using the Tier-2 methodology, three models of meat production in the tropics were selected: a monoculture system (MC, 6 farms), an intensive silvopastoral system (ISP, 6 farms), and a native silvopastoral system (NSP, 6 farms). Twelve of the selected farms were dual-purpose (meat and milk production), and 6 were used for calf production. The EFs were estimated using two main steps: (1) classification of livestock into subcategories: bulls, lactating cows, dry cows, and replacement heifers; and (2) calculation of the gross energy (MJ day−1) intake as prescribed in Chapter 10, Volume 4 of the IPCC (2006 and 2019). The data showed that high and low productivity could be distinguished using the 2019 IPCC but not the 2006 IPCC. Higher average EFs were generated by Tier-1 than by Tier-2. The Tier-2 EFs were higher than the Tier-2MX EFs. These results confirm that Tier-2 methodologies can enhance existing differences. Additionally, the Tier-2MX EFs for each type of cattle were lower than the Tier-2 and Tier-1 EFs. These results show that it is advisable to use methane yields determined for a particular country or region.

Suggested Citation

  • Adriana Rivera-Huerta & María Salud Rubio Lozano & Juan C. Ku-Vera & Leonor Patricia Güereca, 2022. "Emission factors from enteric fermentation of different categories of cattle in the Mexican tropics: a comparison between 2006 and 2019 IPCC," Climatic Change, Springer, vol. 172(3), pages 1-17, June.
    • Handle: RePEc:spr:climat:v:172:y:2022:i:3:d:10.1007_s10584-022-03378-z
    DOI: 10.1007/s10584-022-03378-z
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    References listed on IDEAS

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    1. Dario Caro & Ermias Kebreab & Frank M. Mitloehner, 2016. "Mitigation of enteric methane emissions from global livestock systems through nutrition strategies," Climatic Change, Springer, vol. 137(3), pages 467-480, August.
    2. Harrison, Matthew T. & McSweeney, Chris & Tomkins, Nigel W. & Eckard, Richard J., 2015. "Improving greenhouse gas emissions intensities of subtropical and tropical beef farming systems using Leucaena leucocephala," Agricultural Systems, Elsevier, vol. 136(C), pages 138-146.
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