title: A study of different nitrogen supplements for lactating cows.
mesh_terms: D000818:Animals; D002417:Cattle / Q000378:metabolism*; D004032:Diet; D005260:Female; D007774:Lactation; D008892:Milk / Q000378:metabolism; D009584:Nitrogen / Q000008:administration & dosage* / Q000378:metabolism; D009753:Nutritive Value; D011247:Pregnancy
chemical_list: D009584:Nitrogen