title: Plasma amino acid profiles, urea and ammonia--nitrogen in one- and eight-year-old ewes fed two levels of protein.
mesh_terms: D000375:Aging; D000596:Amino Acids / Q000097:blood; D000641:Ammonia / Q000097:blood; D000818:Animals; D001806:Blood Urea Nitrogen; D004044:Dietary Proteins / Q000378:metabolism*; D005260:Female; D009584:Nitrogen / Q000097:blood; D012756:Sheep / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins; D000641:Ammonia; D009584:Nitrogen