Contextualized re-calculation of enteric methane emission factors for small ruminants in sub-humid Western Africa is far lower than previous estimates

Ndao, Séga; Moulin, Charles‐Henri; Traoré, El Hadji; Diop, Mouhamadou; Bocquier, François

doi:10.1007/s11250-018-1775-4

Cited by 12 publications

(2 citation statements)

References 44 publications

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“…Compared with IPCC, (2006) default emission factors for Africa, higher Tier 2 emission factors were also reported for Benin (40 kg CH 4 herd/year)(Kouazounde et al, 2015). However, lower CH 4 emission factors of 31 and 16 kg CH 4 herd/year were reported for lactating and other cattle (Ndama breed) in Senegal(Ndao et al, 2019). These comparisons highlight the necessity for developing country speci c emission factors that re ect the national circumstances and actual animal management and performance in cattle was higher than the IPCC values from developing countries (African regions) livestock EFs under similar production system and animal functions(Goopy et al, 2021;Herrero et al, 2008; IPCC, 2006IPCC, , 2019Kouazounde et al, 2015…”

mentioning

confidence: 74%

Prediction of greenhouse gas emissions from large ruminants in mixed farming system of Southeast Ethiopia

Mamo,

Mengistu,

Shenkute

2024

Preprint

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The estimated enteric methane EFs for adult males used for breeding & for other purposes, adult multipurpose cows, adult males used for draught, growing males, growing females, calves aged 6monts-1 year (male and female) and calves aged < 6 months (male and female) were significantly (P < 0.01) different than those of cattle subcategories. The estimated enteric CH 4 EF of dual-purpose cattle were significantly (P < 0.001) differed between lowland agro-ecology and other agro-ecologies. Among the total population in the zone, cattle (accounted 83.88%) of the total population. Among the agro-ecologies, the lowland area had the highest share (33.61%), followed by the midland (33.23%) and highland (33.16%) areas. The share of agro-ecologies per total population was highland area (43.54%) followed by midland (35.23%) and lowland (21.23%). The estimated CH4 emission from manure handling practices in the study area were significantly different (P < 0.001) between the sub-category of dual-purpose cattle except for those from adult multipurpose cows > 3 years old and those from adult males used for draught (3–10 years old). The estimated CH4 emissions from manure of dual-purpose cattle were significantly (P < 0.001) different between lowland agro-ecology and other agro-ecologies. The estimated nitrous oxide concentrations for adult males used for breeding and other purpose, adult males used for draught, adult multipurpose cows, growing males, growing females, calves aged 6 month–<1 year (male and female) and calves aged < 6 months (male and female) were significantly (P < 0.001) different between the cattle subcategories. The estimated nitrous oxide concentration in dual-purpose cattle were significantly (P < 0.001) greater for lowland agro-ecology than for other agro-ecologies.

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mentioning

confidence: 74%

Prediction of greenhouse gas emissions from large ruminants in mixed farming system of Southeast Ethiopia

Mamo,

Mengistu,

Shenkute

2024

Preprint

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“…The Tier I EF, which employs a universal factor for all animals of one species (in Africa), fails to properly account for differences in production systems across various climatic zones, as demonstrated by the modelling approach of Herrero et al (2008). To place the importance of spatially explicit data in context, of the two known African studies that have produced revised EF for SR, the South African study (Du Toit et al 2013) found that Tier I estimates were 20-40% lower than the calculated EF for SR, while Ndao et al (2019) found that Tier I overestimated the EF of West African sheep and goats by 50-65%. Clearly, there is a need to develop, at least, region-specific estimates for SR EF.…”

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confidence: 99%

Calculation of new enteric methane emission factors for small ruminants in western Kenya highlights the heterogeneity of smallholder production systems

et al. 2021

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Context African livestock play a critical role in food security and the wider economy, while accounting for >70% of African agricultural greenhouse gas emissions. Accurate estimates of greenhouse gas emissions from livestock are required for inventory purposes and to assess the efficacy of mitigation measures. While there is an increasing number of studies assessing methane (CH4) emissions of cattle, little attention has been paid to small ruminants (SR). Aims Enteric CH4 emissions were assessed from 1345 SR in three counties of western Kenya to develop more accurate emission factors (EF) for enteric CH4 from sheep and goats. Methods Using on-farm animal activity data, feed samples were also analysed to produce estimates of feed digestibility by season and region. The combined data were also used to estimate daily CH4 production by season, location and class of animal to produce new EF for annual enteric CH4 production of SR. Key results Mean dry-matter digestibility of the feed basket was in the range of 58–64%, depending on region and season (~10% greater than Tier I estimates). EF were similar for sheep (4.4 vs 5 kg CH4/year), but lower for goats (3.7 vs 5 kg CH4/year) than those given for SR in developing countries in Intergovernmental Panel on Climate Change (Tier I) estimates. Conclusions Published estimates of EF for SR range widely across Africa. In smallholder systems in western Kenya, SR appear to be managed differently from cattle, and EF appear to be driven by different management considerations. Implications The findings highlighted the heterogenous nature of SR enteric emissions in East Africa, but also suggested that emissions from SR are quantitatively less important than other estimates suggest compared with cattle.

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Indirect measures of methane emissions of Sahelian zebu cattle in West Africa, role of environment and management

Bois¹,

Morgavi²,

García³

et al. 2020

Trop Anim Health Prod

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Contextualized re-calculation of enteric methane emission factors for small ruminants in sub-humid Western Africa is far lower than previous estimates

Cited by 12 publications

References 44 publications

Prediction of greenhouse gas emissions from large ruminants in mixed farming system of Southeast Ethiopia

Prediction of greenhouse gas emissions from large ruminants in mixed farming system of Southeast Ethiopia

Calculation of new enteric methane emission factors for small ruminants in western Kenya highlights the heterogeneity of smallholder production systems

Indirect measures of methane emissions of Sahelian zebu cattle in West Africa, role of environment and management

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