Twenty-four yearling Boer × Spanish wethers were used to assess effects of different forages, either fresh (Exp. 1) or as hay (Exp. 2), on feed intake, digestibilities, heat production, and ruminal methane emission. Treatments were: 1) Sericea lespedeza (SER; Lespedeza cuneata), a legume high in condensed tannins (CT; 20% and 15% in fresh forage and hay, respectively), 2) SER supplemented with ...

Methane emission f rom l ivestock and agricultural wastes contribute globally more than 3 0 % to the anthropogenic atmospheric methane source. Estimates of this number have been derived f rom respiration chamber experiments. W e determined methane emission rates f rom a tracer experiment in a modern cow shed hosting 43 dairy cows in their accustomed environment. During a 24-hour period the conc...

Post-treatment of anaerobic wastewater was undertaken to biologically oxidize dissolved methane, with the aim of preventing methane emission. The performance of dissolved methane oxidation and competition for oxygen among methane, ammonium, organic matter, and sulfide oxidizing bacteria were investigated using a lab-scale closed-type down-flow hanging sponge (DHS) reactor. Under the oxygen abun...

[1] The magnitude and feedbacks of future methane release from the Arctic region are unknown. Despite limited documentation of potential future releases associated with thawing permafrost and degassing methane hydrates, the large potential for future methane releases calls for improved understanding of the interaction of a changing climate with processes in the Arctic and chemical feedbacks in ...

Methanogenesis is a microbial process in which organic matter is assimilated and metabolized with the ultimate production of biogas that contains methane and carbon dioxide in the approximate ratio of 2:1. It represents a major electron sink in the metabolism of termites. An understanding of the dominant methanogens inside termite gut and their efficiency in the production of methane can find a...

Mexico City is the world’s largest and most polluted urban center. We examine the distribution of methane and other hydrocarbons within the Valley of Mexico, using it as a model for the role developing megacities will play in the next century of geochemical cycling. Seventy-five whole air samples were analyzed with multivariate statistical techniques, including factor analysis using principal c...

A brief summary of R&D for two-phase emission detectors based on the extraction of ionisation electrons from condensed nonpolar dielectrics into the gas phase is presented. Preliminary results from tests of an emission detector filled with solid methane and gaseous neon are described. Possible applications of massive emission detectors are discussed. ( 1999 Elsevier Science B.V. All rights rese...

The objective of this study was to evaluate the in vitro effects of flavonoid-rich plant extracts (PE) on ruminal fermentation characteristics and methane emission by studying their effectiveness for methanogenesis in the rumen. A fistulated Holstein cow was used as a donor of rumen fluid. The PE (Punica granatum, Betula schmidtii, Ginkgo biloba, Camellia japonica, and Cudrania tricuspidata) kn...