Article Bone loss Osteoporosis Ovariectomized rat Ovariectomy Tocotrienol-rich fraction Virgin coconut oil alpha tocotrienol animal experiment animal model animal tissue bone mineral bone surface density calcein carboxy terminal telopeptide coconut oil conjugated estrogen controlled study enzyme linked immunosorbent assay female femur histology lipid diet morphometry nonhuman ossification osteocalcin osteolysis osteoporosis ovariectomy-induced osteoporosis