title: Passage of endogenous urea nitrogen across the rumen wall in sheep before and after feeding.
mesh_terms: D000641:Ammonia / Q000378:metabolism; D000818:Animals; D001692:Biological Transport; D004044:Dietary Proteins; D008722:Methods; D009584:Nitrogen / Q000378:metabolism*; D009747:Nutritional Physiological Phenomena; D012417:Rumen / Q000378:metabolism*; D012756:Sheep; D014508:Urea / Q000378:metabolism*
chemical_list: D004044:Dietary Proteins; D000641:Ammonia; D014508:Urea; D009584:Nitrogen