title: Effect of protein levels and opaque-2 corn on nitrogen metabolism in the sow and litter during the first and second lactation periods.
mesh_terms: D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D000831:Animals, Newborn / Q000378:metabolism; D001835:Body Weight; D004044:Dietary Proteins; D005243:Feces / Q000032:analysis; D005260:Female; D007774:Lactation; D008892:Milk / Q000032:analysis; D009584:Nitrogen / Q000097:blood / Q000378:metabolism* / Q000652:urine; D009751:Nutritional Requirements; D011247:Pregnancy; D013552:Swine / Q000378:metabolism*; D003313:Zea mays
chemical_list: D004044:Dietary Proteins; D009584:Nitrogen