title: Calcium requirement of ducklings.
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000032:analysis; D002136:Calcium, Dietary / Q000378:metabolism*; D004372:Ducks / Q000378:metabolism*; D005260:Female; D008297:Male; D010758:Phosphorus / Q000032:analysis; D011201:Poultry Diseases / Q000209:etiology*
chemical_list: D002136:Calcium, Dietary; D010758:Phosphorus