Abstract
Ruminal methanogenesis is considered a digestive inefficiency that results in the loss of 2-12% of the host’s gross energy intake and contributes nearly 20% to the United States annual CH 4 emissions. Presently, the effects of the known CH 4 inhibitor, nitroethane, and two synthetic nitrocompounds, dimethyl-2-nitroglutarate and 2-nitro-methyl-propionate, on ruminal CH 4 production and fermentation were evaluated in vitro. After 24 h incubation at 39°C under 100% CO 2, ruminal fluid cultures treated with 2.97 or 11.88 μmol ml -1 of the respective nitrocompounds produced > 92% less CH 4 ( P < 0.05) than non-treated controls. Quantification of fermentation end-products produced and H 2 balance estimates indicate that fermentation efficiencies were not compromised by the nitro-treatments.
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