title: Calcium requirement for bone maintenance of aged non-laying hens.
mesh_terms: D000284:Administration, Oral; D000375:Aging; D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D001842:Bone and Bones / Q000378:metabolism*; D002118:Calcium / Q000032:analysis / Q000378:metabolism*; D002136:Calcium, Dietary / Q000008:administration & dosage; D002645:Chickens / Q000378:metabolism*; D004032:Diet; D005260:Female; D009751:Nutritional Requirements; D010710:Phosphates / Q000032:analysis; D011374:Progesterone / Q000008:administration & dosage; D013977:Tibia / Q000032:analysis / Q000378:metabolism
chemical_list: D002136:Calcium, Dietary; D010710:Phosphates; D011374:Progesterone; D002118:Calcium