Access to Emission Control Blocks for improved productivity and mitigation of enteric methane in smallholder cattle in Cambodia
James R. Young
A , Socheat Sieng B , Peter C. Thomson A , Julian Hill C and Peter A. Windsor A *
A
B Private Contractor,
C
Abstract
Livestock raising is important in Cambodia, with an estimated 3.4 million cattle located in 780,000 smallholder farming households. However, productivity is low, constrained by poor animal nutrition, health and management.
This study examined supplementation of cattle with 20 kg ‘Emission Control Blocks’ (ECB, AgCoTech Laos) to test for improved growth rates and reduced enteric methane production.
Smallholder farmers (n = 40) within two villages in Pursat Province each provided two age- and weight-matched local breed cattle (n = 80). One animal from each of the 40 farms was designated ‘treatment’ and accessed the ECB for a 10-week period, with ‘control’ animals denied access. To assess production impacts and estimate methane emissions, regular measurements included body weight by tape to calculate average daily gain (ADG), body condition score (BCS), and ECB consumption rates. Trial results were used to model methane emissions using the Intergovernmental Panel on Climate Change (IPCC) Tier 2 calculator. Additionally, at the end of the trial, breath methane concentration was measured by a handheld methane monitor in both groups, enabling a recording of breath methane abatement.
The average body weight of the ‘treatment’ cattle increased by 5.31 kg (ADG of 76 g/day) compared to 2.97 kg (ADG of 42 g/day) in ‘control’ animals that completed the trial, a significant difference (P < 0.05). A ‘dose-response’ effect of ECB consumption was observed, with increased body weight by 0.33 kg/kg ECB consumed in the first 5 weeks (P = 0.036), increasing to 1.33 kg/kg ECB consumed in the second 5-week period (P < 0.001). No differences in BCS between groups were observed. Modelling using IPCC inventory software indicated the block reduced carbon dioxide equivalent (CO2e) of emissions from a baseline of 1320 kg to 1100 kg per annum. The effect of ECBs (P = 0.0019) on enteric or breath methane concentration was confirmed, with ‘treatment’ producing an average estimated 88.0 g/day compared with 106.0 g/day for ‘control’, a 17.0% decrease in daily methane production, extrapolated to 184 kg CO2e per annum.
These findings occurred despite lower ECB consumption rates than expected, attributed to excessive hardness of this batch of blocks. ECBs offer both productivity gains and enteric methane abatement in cattle.
If widely available, use of ECBs may support Cambodia in meeting Nationally Determined Contributions and the Global Methane Pledge.
Keywords: agricultural development, cattle productivity, emission control blocks, emissions intensity, improved productivity, methane abatement.
References
Aboagye IA, Oba M, Castillo AR, Koenig KM, Iwaasa AD, Beauchemin KA (2018) Effects of hydrolyzable tannin with or without condensed tannin on methane emissions, nitrogen use, and performance of beef cattle fed a high-forage diet. Journal of Animal Science 96, 5276-5286.
| Crossref | Google Scholar |
ACIAR (2013) Cattle health, production and trade in Cambodia. In ‘Proceedings from three ACIAR-funded projects presented at an international workshop held in Phnom Penh, Cambodia’, 7–8 June 2011. ACIAR Proceedings No. 138. (Eds JR Young, L Rast, S Suon, PA Windsor). (Australian Centre for International Agricultural Research: Canberra) Available at http://aciar.gov.au/publication/pr138
AgCoTech Global (2023) Reducing smallholder farmer poverty. Fighting climate change. Available at https://agcotechglobal.com [Verified 20 December 2023]
Aquino D, Del Barrio A, Xuan Trach N, Thanh Hai N, Nguyen Khang D, Tat Toan N, Van Hung N (2020) Rice straw–based fodder for ruminants. In ‘Sustainable rice straw management’. (Eds M Gummert, M Palao, H Freund) pp. 107–127. (Springer: Cham) 10.1007/978-3–030–32373–8_7
Ashley K, Young JR, Kea P, Suon S, Windsor PA, Bush RD (2018) Socioeconomic impact of forage technology adoption by smallholder cattle farmers in Cambodia. Animal Production Science 58, 393-402.
| Crossref | Google Scholar |
Beauchemin KA, Ungerfeld EM, Eckard RJ, Wang M (2020) Review: Fifty years of research on rumen methanogenesis: lessons learned and future challenges for mitigation. Animal 14(S1), s2-s16.
| Crossref | Google Scholar |
BPP (2019) Business partnership platform project: enhancing livelihoods of smallholder farmers in Laos project. Available at https://thebpp.com.au/partnership/enhancing-livelihoods-of-smallholder-farmers-in-laos [Verified 20 December 2023]
Bush RD, Young JR, Suon S, Ngim MS, Windsor PA (2014a) Forage growing as an incentive to improve smallholder beef production in Cambodia. Animal Production Science 54, 1620-1624.
| Crossref | Google Scholar |
Bush RD, Page B, Macdonald T, Young JR, Nampanya S, Suon S, Khounsy S, Henry LA, Thomson PC, Windsor PA (2014b) Target feeding for improved smallholder beef production in the Mekong region: lessons from Cambodia and Lao PDR. Animal Production Science 54, 1219-1223.
| Crossref | Google Scholar |
CCCSP (2013) Cambodia climate change strategic plan 2014–2023. National Climate Change Committee. Available at https://www4.unfccc.int/sites/NAPC/Documents/Parties/Cambodia_CCCSP.pdf [Verified 10 August 2024]
CNDC (2020) Cambodia’s updated nationally determined contribution. The General Secretariat of the National Council for Sustainable Development. Ministry of Environment, Cambodia. Available at https://unfccc.int/sites/default/files/NDC/2022-06/20201231_NDC_Update_Cambodia.pdf [Verified 10 August 2024]
FAO CAS (2021) Cambodia Agriculture Survey. National Institute of Statistics, Ministry of Planning, in collaboration with Ministry of Agriculture, Forestry and Fisheries. Available at https://microdata.fao.org/index.php/catalog/2532 [Verified 10 August 2024]
FAO (2007) ‘Feed supplementation blocks.’ FAO animal production and health paper 164. (Eds HPS Makkar, M Sanchez, AW Speedy) (FAO: Rome, Italy). Available at https://www.fao.org/3/a0242e/a0242e00.pdf [Verified 14 August 2024]
FAO (2011) ‘Mapping supply and demand for animal-source foods to 2030.’ Animal production and health working paper 2.’ (FAO: Rome). Available at https://www.fao.org/3/i2425e/i2425e.pdf [Verified 14 August 2024]
FAO (2018) ‘World livestock: transforming the livestock sector through the sustainable development goals.’ (FAO: Rome). p. 222. 10.4060/ca1201en [Verified 14 August 2024]
FAO (2023a) ‘Pathways towards lower emissions – a global assessment of the greenhouse gas emissions and mitigation options from livestock agrifood systems.’ (FAO: Rome). 10.4060/cc9029en [Verified 14 August 2024]
FAO (2023b) ‘World Food and Agriculture – Statistical Yearbook 2023.’ (FAO: Rome). 10.4060/cc8166en [Verified 12 August 2024]
GMP (2024) Global Methane Pledge. Available at https://www.globalmethanepledge.org [Verified 12 August 2024]
Goel G, Makkar HPS (2012) Methane mitigation from ruminants using tannins and saponins. Tropical Animal Health and Production 44, 729-739.
| Crossref | Google Scholar |
Guggenberger T (2021) Final Report. Lemongrass. AREC Raumberg-Gumpenstein. https://s26.q4cdn.com/317237604/files/doc_downloads/2021/04/Final-report-Lemongrass.pdf [Verified 14 August 2024]
IPCC (2019) 2019 refinement to the 2006 IPCC guidelines for national greenhouse gas inventories. (Eds E Calvo Buendia, K Tanabe, A Kranjc, J Baasansuren, M Fukuda, S Ngarize, A Osako, J Pyrozhenko, P Shermanau, S Federici). Published by the Intergovernmental Panel on Climate Change. Available at https://www.ipcc-nggip.iges.or.jp/public/2019rf/index.html
IPCC (2023) IPCC Inventory Software (Version 2.69) [Computer software]. Intergovernmental Panel on Climate Change. Available at https://www.ipcc-nggip.iges.or.jp/software/
Khounsy S, Nampanya S, Inthavong P, Yang M, Khamboungheung B, Avery M, Bush R, Rast L, Windsor PA (2012) Significant mortality of large ruminants due to hypothermia in northern and central Lao PDR. Tropical Animal Health and Production 44, 835-842.
| Crossref | Google Scholar |
MacPhillamy IBJ, Young JR, Vitou S, Chanphalleap H, Sothoeun S, Windsor PA, Toribio J-AML, Bush RD (2022) Can improving animal health and biosecurity knowledge of para-veterinarians in Cambodia assist in addressing challenges in smallholder livestock farming? Transboundary and Emerging Diseases 69, 559-569.
| Crossref | Google Scholar |
MLRB (2023) Mekong Livestock Research and Beyond: molasses block factory opened in Laos. Available at https://mekonglivestock.wordpress.com/2023/05/08/molasses-block-factory-opened-in-laos/ [Verified 14 August 2024]
MLRB (2024) Mekong Livestock Research and Beyond: enhancing productivity and reducing emissions in Indonesia’s cattle industry. Available at https://mekonglivestock.wordpress.com/2024/06/05/emission-control-blocks-for-cattle-enhancing-productivity-and-reducing-emissions-in-indonesias-cattle-industry/ [Verified 14 August 2024]
Nampanya S, Suon S, Rast L, Windsor PA (2012) Improvement in smallholder farmer knowledge of cattle production, health and biosecurity in southern Cambodia between 2008 and 2010. Transboundary and Emerging Diseases 59, 117-127.
| Crossref | Google Scholar | PubMed |
NSDP (2023) National Strategic Development Plan, Cambodia. Available at https://data.opendevelopmentcambodia.net/laws_record/national-strategic-development-plan-nsdp-2019-2023 [Verified 12 August 2024]
Olmo L, Ashley K, Young JR, Suon S, Thomson PC, Windsor PA, Bush RD (2017) Improving smallholder cattle reproductive efficiency in Cambodia to address expanding regional beef demand. Tropical Animal Health and Production 49, 163-172.
| Crossref | Google Scholar |
Olmo L, Nampanya S, Nemanic T, Selwood N, Khounsy S, Young JR, Thomson PC, Bush RD, Windsor PA (2020) Can fenbendazole-medicated molasses blocks control Toxocara vitulorum in smallholder cattle and buffalo calves in developing countries? Studies from upland Laos. Animal Production Science 60(17), 2031-2043.
| Crossref | Google Scholar |
Rast L, Toribio J-AML, Dhand NK, Khounsy S, Windsor PA (2014) Why are simple control options for Toxocara vitulorum not being implemented by cattle and buffalo smallholder farmers in South-east Asia? Preventive Veterinary Medicine 113, 211-218.
| Crossref | Google Scholar | PubMed |
Rast L, Nampanya S, Toribio J-ALML, Khounsy S, Windsor PA (2017) Fasciola gigantica infection in large ruminants in northern Laos: smallholder knowledge and practices. Animal Production Science 57, 141-146.
| Crossref | Google Scholar |
Samkol P, Sath K, Patel M, Windsor PA, Holtenius K (2015) Survey of smallholder beef cattle production systems in different agro-ecological zones of Cambodia. Tropical Animal Health and Production 47, 1299-1306.
| Crossref | Google Scholar |
Sieng S, Patrick IW, Windsor PA, Walkden-Brown SW, Kerr J, Sen S, Sar C, Smith RGB, Kong R (2022) Contributions of village animal health workers to foot-and-mouth disease control in Cambodia. Transboundary and Emerging Diseases 69, e406-e422.
| Crossref | Google Scholar | PubMed |
Sorg D (2022) Measuring livestock CH4 emissions with the laser methane detector: a review. Methane 1, 38-57.
| Crossref | Google Scholar |
Vadiveloo J (2000) Nutritional properties of the leaf and stem of rice straw. Animal Feed Science and Technology 83, 57-65.
| Crossref | Google Scholar |
Vázquez-Carillo MF, Montelongo-Pérez HD, González-Ronquillo M, Castillo-Gallegos E (2020) Effects of three herbs on methane emissions from beef cattle. Animals 10, 1671.
| Crossref | Google Scholar |
Windsor PA (2011) Perspectives on Australian Animal Health Aid Projects in South-east Asia. Transboundary and Emerging Diseases 58, 375-386.
| Crossref | Google Scholar |
Windsor PA (2023) Multiple benefits of molasses nutrient blocks for cattle: helping the fight against climate change. Available at https://researchoutreach.org/articles/multiple-benefits-molasses-nutrient-blocks-cattle-helping-fight-climate-change/ [Verified 14 August 2024]
Windsor PA (2024) Perspectives on progression of transboundary disease, one health and ecosystem health management in the Greater Mekong Subregion and beyond. Animal Production Science 64, AN23431.
| Crossref | Google Scholar |
Windsor PA, Hill J (2022) Provision of high-quality molasses blocks to improve productivity and address greenhouse gas emissions from smallholder cattle and buffalo: studies from Lao PDR. Animals 12, 3319.
| Crossref | Google Scholar |
Windsor PA, Nampanya S, Kinnavong B, Phommasone P, Bush RD, Khounsy S (2019) Do triclabendazole medicated molasses blocks have a role in control of Fasciola gigantica in smallholder cattle production in Lao PDR? Animal Production Science 59, 787-793.
| Crossref | Google Scholar |
Windsor P, Khounsy S, Earp F, MacPhillamy I, Young J, Bush RD (2020) Managing welfare and antimicrobial-resistance issues in treating foot-and-mouth disease lesions: a new therapeutic approach. Veterinary Medicine: Research and Reports (Auckl) 11, 99-107.
| Crossref | Google Scholar |
Windsor PA, Nampanya S, Olmo L, Khounsy S, Phengsavanh P, Bush RD (2021a) Provision of urea-molasses blocks to improve smallholder cattle weight gain during the late dry season in tropical developing countries: studies from Lao PDR. Animal Production Science 61, 503-513.
| Crossref | Google Scholar |
Windsor P, Martin S, Khounsy S, Young J, Thomson P, Bush R (2021b) Improved milk production from supplementation of swamp buffalo with molasses nutrient blocks containing 10% urea. Dairy 2, 90-103.
| Crossref | Google Scholar |
Windsor PA, Hill J, Olsson D, Cameron A, Martin S (2023) Reduced rumen methane eructation in smallholder cattle and buffalo by dietary supplementation with a plant tannins and citral extract. Preprints 2023, 2023051495. 10.20944/preprints202305.1495.v1
Young JR, O’Reilly RA, Ashley K, Suon S, Leoung IV, Windsor PA, Bush RD (2014) Impacts on rural livelihoods in cambodia following adoption of best practice health and husbandry interventions by smallholder cattle farmers. Transboundary and Emerging Diseases 61, 11-24.
| Crossref | Google Scholar |
Young JR, Evans-Kocinski S, Bush RD, Windsor PA (2015) Improving smallholder farmer biosecurity in the Mekong region through change management. Transboundary and Emerging Diseases 62, 491-504.
| Crossref | Google Scholar |
