Two principles for absorption determinations using isotope-labelled nutrients.
D000818:Animals; D001681:Biological Assay; D004531:Eggs; D066298:In Vitro Techniques; D007408:Intestinal Absorption; D008099:Liver / Q000378:metabolism; D008715:Methionine / Q000378:metabolism; D009747:Nutritional Physiological Phenomena; D010759:Phosphorus Isotopes / Q000378:metabolism*; D011200:Poultry / Q000502:physiology*; D011874:Radiometry; D013460:Sulfur Isotopes
D010759:Phosphorus Isotopes; D013460:Sulfur Isotopes; D008715:Methionine