IleumAbsorptionIntestinal AbsorptionSkin AbsorptionIntestine, SmallBiological AvailabilityIntestinal MucosaSpectrophotometry, AtomicJejunumX-Ray Absorption SpectroscopyGuinea PigsIntestinesDuodenumSpectrophotometryIronAdministration, OralSpectrum AnalysisTime FactorsMuscle, SmoothMyenteric PlexusIleal DiseasesColonZincPhytic AcidFecesIleitisZinc RadioisotopesKineticsIron RadioisotopesZinc IsotopesCaco-2 CellsSpectrophotometry, UltravioletEnterocytesBiological TransportSodiumMalabsorption SyndromesWaterMuscle ContractionDietHydrogen-Ion ConcentrationMicrovilliSitosterolsRabbitsGastrointestinal MotilitySwineLymphDose-Response Relationship, DrugDigestionGastrointestinal TransitBile Acids and SaltsIleal NeoplasmsCecumCalciumDigestive SystemRats, Sprague-DawleyChloridesIntestinal SecretionsIleostomyCalcium, DietaryIron, DietaryFerrous CompoundsRats, WistarCopperBicarbonatesSerous MembranePerfusionCholesterolLiverSpectrophotometry, InfraredPhytosterolsAzetidinesIntestine, LargeRats, Inbred StrainsTissue DistributionCross-Over StudiesChromatography, High Pressure LiquidBiological Transport, ActiveArea Under CurveBileMannitolLightModels, BiologicalAtropineDiphenylacetic AcidsGastrointestinal ContentsAmino AcidsGlucoseGastrointestinal TractInjections, IntravenousPermeabilityCattleLymphatic SystemStomachIleocecal ValveSolubilityFerritinsSpectrometry, FluorescenceAnimal FeedDrug InteractionsHalf-Life