IsofluraneGoatsGoat DiseasesAnesthetics, InhalationHalothaneAnesthesia, InhalationEnfluraneMethyl EthersAnestheticsNitrous OxideEthersAnesthesiaAnesthetics, IntravenousPropofolAnesthetics, GeneralDose-Response Relationship, DrugAnesthesia, GeneralXenonDogsHemodynamicsFentanylAnesthesia Recovery PeriodBlood Gas AnalysisMethoxyfluraneDepression, ChemicalRats, Sprague-DawleySheep DiseasesThiopentalIschemic Preconditioning, MyocardialPulmonary AlveoliElectroencephalographySheepAnesthetics, CombinedEtherDrug InteractionsPentobarbital