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http://dx.doi.org/10.5713/ajas.2011.11352

Indirect Estimation of CH4 from Livestock Feeds through TOCs Evaluation  

Kim, M.J. (Department of Animal Life System, Kangwon National University)
Lee, J.S. (Department of Animal Life System, Kangwon National University)
Kumar, S. (Department of Animal Life System, Kangwon National University)
Rahman, M.M. (Department of Animal Life System, Kangwon National University)
Shin, J.S. (Department of Animal Life System, Kangwon National University)
Ra, C.S. (Department of Animal Life System, Kangwon National University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.25, no.4, 2012 , pp. 496-501 More about this Journal
Abstract
Thirty-five available feeds were fermented in vitro in order to investigate their soluble total organic carbon (TOCs) and methane ($CH_4$) production rate. A fermentation reactor was designed to capture the $CH_4$ gas emitted and to collect liquor from the reactor during in vitro fermentation. The results showed that $CH_4$ production rate greatly varied among feeds with different ingredients. The lowest $CH_4$-producing feeds were corn gluten feed, brewer's grain, and orchard grass among the energy, protein, and forage feed groups, respectively. Significant differences (p<0.05) were found in digestibility, soluble total organic carbon (TOCs), and $CH_4$ emissions among feeds, during 48 h of in vitro fermentation. Digestibility and TOCs was not found to be related due to different fermentation pattern of each but TOCs production was directly proportional to $CH_4$ production (y = 0.0076x, $r^2$ = 0.83). From this in vitro study, TOCs production could be used as an indirect index for estimation of $CH_4$ emission from feed ingredients.
Keywords
Feed; Fermentation; Methane; Total Organic Carbons;
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