Indirect Estimation of CH_4 from Livestock Feeds through TOCs Evaluation
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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 CH4-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.
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 CH4-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.
참고문헌 (16)
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