title: Daily and diurnal variations in the ratio of nitrogen to potassium in the urine of pigs for the estimation of the retained nitrogen.
mesh_terms: D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002940:Circadian Rhythm; D004032:Diet; D005247:Feeding Behavior; D007201:Indicator Dilution Techniques; D008433:Mathematics; D008722:Methods; D009584:Nitrogen / Q000378:metabolism* / Q000652:urine; D011188:Potassium / Q000652:urine*; D013552:Swine; D013997:Time Factors; D014886:Weaning
chemical_list: D009584:Nitrogen; D011188:Potassium