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Effects of dietary TFRD on BMD in caged laying hens. (A) Femur BMD and (B) tibia BMD. Values are means ± SEM (n = 6 per group). The a, b, and c means every bars without same letter differ significantly (P < 0.05). Abbreviations: BMD, bone mineral density; TFRD, total flavonoids of Rhizoma Drynariae; CON, basal diet; TFRD1, basal diet supplemented with 0.5 g/kg TFRD; TFRD2, basal diet supplemented with 2.0 g/kg TFRD.
