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Title: Sheep greenhouse gas emission intensities under different management practices, climate zones and enterprise types
Contributor(s): Cottle, David  (author)orcid ; Harrison, M T (author); Ghanramani, A (author)
Publication Date: 2016
Open Access: Yes
DOI: 10.1071/AN15327
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Abstract: Greenhouse gas emissions (GHG) from broadacre sheep farms constitute ~16% of Australia's total livestock emissions. To study the diversity of Australian sheep farming enterprises a combination of modelling packages was used to calculate GHG emissions from three sheep enterprises (Merino ewe production for wool and meat, Merino-cross ewes with an emphasis on lamb production, and Merino wethers for fine wool production) at 28 sites across eight climate zones in southern Australia. GHG emissions per ha, per dry sheep equivalents and emissions intensity (EI) per tonne of clean wool or liveweight sold under different pasture management or animal breeding options (that had been previously determined in interviews with farmers) were assessed relative to baseline farms in each zone ('Nil' option). Increasing soil phosphorus fertility or sowing 40% of the farm area to lucerne resulted in the smallest and largest changes in GHG/ dry sheep equivalents, respectively (-66%, 113%), though both of these options had little influence on EI for either clean wool or liveweight sold. Breeding ewes with greater body size or genotypes with higher fleece weight resulted in 11% and 9% reductions, respectively, in EI. Enterprises specialising in lamb production (crossbred ewes) had 89% lower EI than enterprises specialising in fine wool production (Merino wethers). Thus, sheep producers aiming for lower EI could focus more on liveweight turnoff than wool production. Emissions intensities were typically highest in cool temperate regions with high rainfall and lowest in semiarid and arid regions with low aboveground net primary productivity. Overall, animal breeding options reduced EI more than feedbase interventions.
Publication Type: Journal Article
Source of Publication: Animal Production Science, 56(3), p. 507-518
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1836-5787
Fields of Research (FoR) 2008: 070201 Animal Breeding
070204 Animal Nutrition
070203 Animal Management
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
300303 Animal nutrition
300302 Animal management
Socio-Economic Objective (SEO) 2008: 830311 Sheep - Wool
830310 Sheep - Meat
Socio-Economic Objective (SEO) 2020: 100413 Sheep for wool
100412 Sheep for meat
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article

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