干旱区生态环境知识资源中心(Arid): Farm-level emission intensities of smallholder cattle (Bos indicus; B. indicus-B. taurus crosses) production systems in highlands and semi-arid regions

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DOI	10.1016/j.animal.2021.100445
	Farm-level emission intensities of smallholder cattle (Bos indicus; B. indicus-B. taurus crosses) production systems in highlands and semi-arid regions
	Ndung'u, P. W.; Takahashi, T.; du Toit, C. J. L.; Robertson-Dean, M.; Butterbach-Bahl, K.; McAuliffe, G. A.; Merbold, L.; Goopy, J. P.
通讯作者	Goopy, JP
来源期刊	ANIMAL
ISSN	1751-7311
EISSN	1751-732X
出版年	2022
卷号	16 期号:1
英文摘要	Ruminants are central to the economic and nutritional life of much of sub-Saharan Africa, but cattle are now blamed for having a disproportionately large negative environmental impact through emissions of greenhouse gas (GHG). However, the mechanism underlying excessive emissions occurring only on some farms is imperfectly understood. Reliable estimates of emissions themselves are frequently lacking due to a paucity of reliable data. Employing individual animal records obtained at regular farm visits, this study quantified farm-level emission intensities (EIs) of greenhouse gases of smallholder farms in three counties in Western Kenya. CP was chosen as the functional unit to capture the outputs of both milk and meat. The results showed that milk is responsible for 80-85% of total CP output. Farm EI ranged widely from 20 to >1 000 kg CO2-eq/kg CP. Median EIs were 60 (Nandi), 71 (Bomet), and 90 (Nyando) kg CO2-eq/kg. Although median EIs referenced to milk alone (2.3 kg CO2-eq/kg milk) were almost twice that reported for Europe, up to 50% of farms had EIs comparable to the mean Pan-European EIs. Enteric methane (CH4) contributed >95% of emissions and manure similar to 4%, with negligible emissions attributed to inputs to the production system. Collecting data from individual animals on smallholder farms enabled the demonstration of extremely heterogeneous EI status among similar geographical spaces and provides clear indicators on how low EI status may be achieved in these environments. Contrary to common belief, our data show that industrial-style intensification is not required to achieve low EI. Enteric CH4 production overwhelmingly drives farm emissions in these systems and as this is strongly collinear with nutrition and intake, an effort will be required to achieve an efficient frontier between feed intake, productivity, and GHG emissions. (C) 2021 The Author(s). Published by Elsevier B.V. on behalf of The Animal Consortium.
英文关键词	African livestock system Carbon footprint CP Life cycle assessment Primary data
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000826439700009
WOS关键词	GREENHOUSE-GAS EMISSIONS ; ENTERIC METHANE EMISSIONS ; DAIRY PRODUCTION SYSTEMS ; NITROUS-OXIDE EMISSIONS ; LIFE-CYCLE ASSESSMENT ; CARBON FOOTPRINT ; LIVESTOCK PRODUCTION ; PREDICT METHANE ; MILK-PRODUCTION ; BEEF-PRODUCTION
WOS类目	Agriculture, Dairy & Animal Science ; Veterinary Sciences
WOS研究方向	Agriculture ; Veterinary Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391813
推荐引用方式 GB/T 7714	Ndung'u, P. W.,Takahashi, T.,du Toit, C. J. L.,et al. Farm-level emission intensities of smallholder cattle (Bos indicus; B. indicus-B. taurus crosses) production systems in highlands and semi-arid regions[J],2022,16(1).
APA	Ndung'u, P. W..,Takahashi, T..,du Toit, C. J. L..,Robertson-Dean, M..,Butterbach-Bahl, K..,...&Goopy, J. P..(2022).Farm-level emission intensities of smallholder cattle (Bos indicus; B. indicus-B. taurus crosses) production systems in highlands and semi-arid regions.ANIMAL,16(1).
MLA	Ndung'u, P. W.,et al."Farm-level emission intensities of smallholder cattle (Bos indicus; B. indicus-B. taurus crosses) production systems in highlands and semi-arid regions".ANIMAL 16.1(2022).