title: Passage of 15N-labelled urea nitrogen from the blood into the sheep rumen and its recirculation.
mesh_terms: D000818:Animals; D007275:Injections, Intravenous; D007421:Intestine, Small / Q000378:metabolism; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D009584:Nitrogen / Q000008:administration & dosage; D009587:Nitrogen Isotopes; D009851:Omasum / Q000378:metabolism; D012417:Rumen / Q000378:metabolism*; D012756:Sheep / Q000378:metabolism*; D013997:Time Factors; D014508:Urea / Q000008:administration & dosage / Q000097:blood* / Q000378:metabolism
chemical_list: D009587:Nitrogen Isotopes; D014508:Urea; D009584:Nitrogen