Breed and Season-Specific Methane Conversion Factors Influence Methane Emission Factor for Enteric Methane of Dairy Steers

Mahfuzul Islam, Seon-Ho Kim, A-Rang Son, Sung-Sill Lee and Sang-Suk Lee
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Mahfuzul Islam: Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, Sunchon National University, Suncheon 57922, Korea
Seon-Ho Kim: Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, Sunchon National University, Suncheon 57922, Korea
A-Rang Son: Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, Sunchon National University, Suncheon 57922, Korea
Sung-Sill Lee: Institute of Agriculture and Life Science and University-Centered Labs, Gyeongsang National University, Jinju 52828, Korea
Sang-Suk Lee: Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, Sunchon National University, Suncheon 57922, Korea

Sustainability, 2022, vol. 14, issue 12, 1-9

Abstract: This study determined the breed and the season-specific methane (CH 4 ) conversion factor (Y m ) and the emission factor (EF) for the enteric CH 4 of dairy steers. The Y m values for Holstein and Jersey steers at different seasons were calculated using the IPCC 2006 equations by incorporating the input and/or output value of the chemical composition of feed, methane production, methane yield, dry matter intake, and methane energy emission. EFs were categorized into five types depending on the 2019 refinement to the IPCC 2006 Tier 2 equations used. EF A was calculated from Equation 10.21A (New), while other EFs were estimated from the Equation 10.21 which were designated according to the gross energy intake (GEI) and Y m as EF B (GEI i and Y m ), EF C (GEI ii and Y m ), EF D (GEI ii and Y m (6.3) ), and EF E (GEI ii and Y m (4.0) ). The calculated overall Y m for Holstein and Jersey steers were 4.90 and 7.49, while the recorded EF of group EF A were 56.44 and 67.42 kg CH 4 /head/year for Holstein and Jersey steers, respectively. For Holstein steers, EF D was overestimated (75.91 vs. 48.20~58.15), while in Jersey steers, the EF F underestimated the EF (kg CH 4 /head/year) compared to others (40.15 vs. 63.24~73.28) ( p < 0.05). Mixed analysis revealed that the breed influenced EFs of all the EF groups, while the season, and the breed × the season influenced EFs of group EF C , EF D , and EF F . The overall results recommended using the breed-specific Y m for the estimation of the EF for enteric methane in dairy steers.

Keywords: enteric methane emission; methane conversion factor; methane emission factor; Holstein steers; Jersey steers (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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