title: Radiometric estimation of the amount of solid gastrointestinal contents.
mesh_terms: D000818:Animals; D001823:Body Composition; D002250:Carbon Radioisotopes; D002417:Cattle / Q000378:metabolism*; D004064:Digestive System / Q000378:metabolism*; D005063:Europium; D005243:Feces / Q000032:analysis*; D005402:Fistula; D005769:Gastrointestinal Motility; D011092:Polyethylene Glycols; D011865:Radioisotope Dilution Technique; D011868:Radioisotopes; D012417:Rumen / Q000378:metabolism* / Q000601:surgery
chemical_list: D002250:Carbon Radioisotopes; D011868:Radioisotopes; D011092:Polyethylene Glycols; D005063:Europium