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http://dx.doi.org/10.5713/ajas.2004.1255

Effects of Halogenated Compounds, Organic Acids and Unsaturated Fatty Acids on In vitro Methane Production and Fermentation Characteristics  

Choi, N.J. (School of Agricultural Biotechnology, Seoul National University)
Lee, S.Y. (School of Agricultural Biotechnology, Seoul National University)
Sung, H.G. (School of Agricultural Biotechnology, Seoul National University)
Lee, S.C. (National Livestock Research Institute, Rural Development Administration)
Ha, J.K. (School of Agricultural Biotechnology, Seoul National University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.17, no.9, 2004 , pp. 1255-1259 More about this Journal
Abstract
The objective of this study was to evaluate the effects of halogenated compounds, organic acids, unsaturated fatty acids and their mixtures on in vitro methane production and fermentative characteristics of mixed rumen microorganisms. Agents used in two in vitro experiments were bromoethanesulfonic acid (BES) and pyromellitic diimide (PMDI) as halogenated compound, fumarate and malate as organic acid, and linoleic acid and linolenic acid as unsaturated fatty acid sources. Ruminal fluid collected from a Holstein steer fed tall fescue and concentrate mixtures was incubated at $39^{\circ}C$ for 48 h with addition of those materials. Single supplementation of halogenated compounds, organic acids or unsaturated fatty acids decreased in vitro methane production (p<0.05). The second experiment was designed to investigate effects of combination of one of halogenated compounds and either organic acids or fatty acids on methane production. Lower concentration of methane and lower A:P ratio were observed with PMDI compared with BES (p<0.01). In general medium pH, VFA, total gas and hydrogen production, and dry matter degradability were affected by addition of the same compounds. In addition, PMDI+malate treatment resulted in the highest molar proportion of propionate, and lowest A:P ratio and methane production (p<0.01). Hydrogen production was highest in PMDI+linolenic acid and lowest in BES+malate treatment (p<0.01). PMDI+malate combination was the most recommendable in reducing methane production without too much influence on digestibility under conditions of present studies.
Keywords
Methane; Fermentation; Halogenated Compounds; Organic Acids; Unsaturated Fatty Acids;
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