RumenSwimming PoolsPositron-Emission TomographyOtoacoustic Emissions, SpontaneousCiliophoraFermentationFatty Acids, VolatileAnimal FeedTomography, Emission-ComputedSheepMethaneReticulumCattleRuminantsVehicle EmissionsDigestionFluorodeoxyglucose F18RadiopharmaceuticalsBacteriaTomography, Emission-Computed, Single-PhotonEukaryotaAbomasumNitrogenAmmoniaStomach, RuminantFibrobacterSilageGene PoolAnimal Nutritional Physiological PhenomenaGreenhouse EffectMethanobrevibacterPoaceaeFluorine RadioisotopesRuminococcusSpectrometry, FluorescenceCelluloseOmasumGastrointestinal ContentsPropionatesButyrivibrioMedicago sativaHydrogen-Ion ConcentrationPeptococcaceaeDietCarbon FootprintMonensinAir PollutantsCarbon RadioisotopesGram-Negative Anaerobic BacteriaMultimodal ImagingAnaerobiosisCarbon DioxideBacteroidesHydrogenationPentanesAtmosphereEubacteriumTomography, X-Ray ComputedPrevotellaMetagenomeCerealsVolatilizationBrainAcetatesDietary FiberTime FactorsZea maysGoatsEnvironmental MonitoringFluorescent DyesCellobioseEructationGastric JuiceKineticsGasesGasolineFluorescenceFossil FuelsStarchRandom AllocationAbsorptionFungiButyratesDietary ProteinsRNA, Ribosomal, 16SSelenomonasPower PlantsVolatile Organic CompoundsDairyingCoalMethanobacterialesSpectrometry, X-Ray EmissionFatty AcidsDenitrificationSensitivity and SpecificityPhylogenyNitrous OxideLuminescenceFurans