CholecalciferolHydroxycholecalciferolsCalcifediolErgocalciferolsDihydroxycholecalciferolsVitamin D DeficiencyVitamin DNebraskaDihydrotachysterolRickets24,25-Dihydroxyvitamin D 3Vitamins25-Hydroxyvitamin D 2PhosphorusCalcitriolDietary SupplementsSteroid HydroxylasesHydroxylationCholestanetriol 26-MonooxygenaseTrichosurusChickensCalcium, DietaryParathyroid Hormone25-Hydroxyvitamin D3 1-alpha-HydroxylaseIntestinal AbsorptionPest ControlReceptors, CalcitriolCalciumBone Density Conservation AgentsFood, FortifiedBone and BonesDuodenumTromethamineAdministration, OralDietSunlightCalcium RadioisotopesDouble-Blind MethodSeasonsMineralsS100 Calcium Binding Protein GEthacrynic AcidBreadBone DensityNutritional Requirements