title: Standardization of nitrogen-balance experiments with rats. II. Experimental prodecure and techniques used in the evaluation of the experiments.
mesh_terms: D000821:Animal Feed; D000818:Animals; D000830:Animals, Laboratory / Q000378:metabolism*; D001947:Breeding; D004063:Digestion; D004864:Equipment and Supplies; D009584:Nitrogen / Q000378:metabolism*; D051381:Rats; D012106:Research / Q000592:standards*
chemical_list: D009584:Nitrogen