Dose-response effects of Asparagopsis taxiformis and Oedogonium sp. on in vitro fermentation and methane production

Machado, Lorenna, Magnusson, Marie, Paul, Nicholas A., Kinley, Robert, de Nys, Rocky, and Tomkins, Nigel (2016) Dose-response effects of Asparagopsis taxiformis and Oedogonium sp. on in vitro fermentation and methane production. Journal of Applied Phycology, 28 (2). pp. 1443-1452.

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This study aimed to identify the optimal doses of the macroalgae Asparagopsis taxiformis and Oedogonium sp., individually and in combination, which would decrease the in vitro production of methane while minimizing adverse effects on fermentation, using rumen inoculant from Bos indicus steers. The dose-response experiment evaluated ten doses of Asparagopsis [ranging from 0 to 16.7 % of the organic matter (OM) incubated] and seven doses of Oedogonium (ranging from 0 to 100 % OM) using Rhodes grass hay as a basal substrate. Asparagopsis was highly effective in decreasing the production of methane with a reduction of 99 % at doses as low as 2 % OM basis. However, a dose of 2 % OM also decreased the production of volatile fatty acids (VFA). Oedogonium was less effective with doses a parts per thousand yen50 % OM significantly decreasing the production of methane. A combination of Asparagopsis (2 % OM) and Oedogonium (25 and 50 % OM) continued to suppress the production of methane, independent of the inclusion rate of Oedogonium. The effectiveness of Asparagopsis demonstrates its potential for the mitigation of methane emissions from ruminants at inclusion rates of a parts per thousand currency sign2 % OM. Oedogonium is a potential feed supplement due to its nutritional value, but supplements a parts per thousand currency sign25 % OM are recommended to avoid adverse effects on apparent in vitro fermentation.

Item ID: 43993
Item Type: Article (Research - C1)
ISSN: 1573-5176
Keywords: Asparagopsis, rhodophyta, greenhouse gas mitigation, methane, volatile fatty acids, ruminant, cattle feed
Funders: Australian Government Department of Agriculture (AG-DA), Australian Government (AG), Australian Renewable Energy Agency (ARENA), Advanced Manufacturing Cooperative Research Centre (AMCRC)
Projects and Grants: AG-DA National Livestock Methane Production Project,
Date Deposited: 20 Apr 2016 07:35
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3003 Animal production > 300303 Animal nutrition @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8398 Environmentally Sustainable Animal Production > 839802 Management of Greenhouse Gas Emissions from Animal Production @ 100%
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