Digestive SystemDigestive System NeoplasmsDigestive System DiseasesDuodenal NeoplasmsDigestive System Physiological PhenomenaDuodenal DiseasesGastrointestinal TractDigestionIntestine, SmallStomachJejunumBrunner GlandsDuodenal ObstructionIntestinal MucosaIntestinesPancreasGastrointestinal MotilityIleumDuodenoscopyNational Institute of Diabetes and Digestive and Kidney Diseases (U.S.)Gastrointestinal ContentsIntestinal AbsorptionDuodenitisPancreatic JuiceGastrointestinal TransitRumenGastrointestinal DiseasesPylorusAnimal FeedPyloric AntrumAmylasesAbomasumDecontaminationDigestive System AbnormalitiesGastrointestinal NeoplasmsCholecystokininIntestinal SecretionsGastric EmptyingSecretinDigestive System Surgical ProceduresMyoelectric Complex, MigratingEndoscopy, GastrointestinalDuodenal UlcerPancreaticoduodenectomyEnteropeptidaseSucraseAmpulla of VaterUpper Gastrointestinal TractGastric MucosaStomach, RuminantSwineColonFecesEpirizoleEsophagusSigns and Symptoms, DigestiveEatingGerm-Free LifeCecumGastrointestinal HemorrhageStomach DiseasesHydrogen-Ion ConcentrationCattlePancreatitisHepatopancreasDietIntestine, LargeBicarbonatesHydrochloric AcidIntubation, GastrointestinalEnteroendocrine CellsMotilinTrypsinogenNitrogenMuscle, SmoothDigestive System FistulaGastric JuiceAnimal Nutritional Physiological PhenomenaCommon Bile DuctGallbladderEndoscopy, Digestive SystemFatty Acids, VolatileTime FactorsDuodenumDietary FiberMicrovilliLipaseGastrointestinal HormonesEnterocytesIntestinal NeoplasmsRats, WistarImmunohistochemistrySphincter of OddiIntestinal FistulaS100 Calcium Binding Protein GSuperior Mesenteric Artery SyndromeIntestinal DiseasesPancreatic DuctsEndocrine Gland NeoplasmsJejunal Neoplasms