Effects of halogenated coumpounds with and without organic acids or unsaturated fatty acids on in vitro methane production.

Lee S.Y., . and Sung H.G. Choi N.J., . and Sang S. Lee, . and H.G. Sung, . and J.K. Ha, . (2004) Effects of halogenated coumpounds with and without organic acids or unsaturated fatty acids on in vitro methane production. [Proceedings Paper]

The objective of this study was to evaluate the effects of combination of one of halogenated coumpounds and either organic acids or fatty acids on in vitro methane production and fermentative characteristics of mixed rumen microorganisms. Ruminal fluid was collected from a Holstein steer on the mixture of tall fescue and concentrate and incubated at 39 degree celcius for 48 h with addition of those materials. Lower concentration of methane and lower A:P ratio were observed with PMDI compared with BES P less than 0.01. However no further reduction in methane production was obtained by the addition of organic acids unsaturated fatty acids. In general medium pH VFA total gas and hydrogen production and matter degradability were affected by addition of the same coumpounds. In addition PMDImalate treatment resulted in the highest molar proportion of propionate and lowest A:P ratio and methane production P less than 0.01. Hydrogen production was highest in PMDIlinolenic acid and lowest in BESmalate treatment P less than 0.01. PMDImalate combination was the most recommendable in reducing methane production under conditions of present studies.

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Abstract

The objective of this study was to evaluate the effects of combination of one of halogenated coumpounds and either organic acids or fatty acids on in vitro methane production and fermentative characteristics of mixed rumen microorganisms. Ruminal fluid was collected from a Holstein steer on the mixture of tall fescue and concentrate and incubated at 39 degree celcius for 48 h with addition of those materials. Lower concentration of methane and lower A:P ratio were observed with PMDI compared with BES P less than 0.01. However no further reduction in methane production was obtained by the addition of organic acids unsaturated fatty acids. In general medium pH VFA total gas and hydrogen production and matter degradability were affected by addition of the same coumpounds. In addition PMDImalate treatment resulted in the highest molar proportion of propionate and lowest A:P ratio and methane production P less than 0.01. Hydrogen production was highest in PMDIlinolenic acid and lowest in BESmalate treatment P less than 0.01. PMDImalate combination was the most recommendable in reducing methane production under conditions of present studies.

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	METHANE
AGROVOC Term:	ORGANIC ACIDS
AGROVOC Term:	FATTY ACIDS
AGROVOC Term:	RUMEN MICROORGANISMS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16734

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