This study compared morphological, densitometric and mechanical properties of femur, tibia and tarsometatarsus in male ostriches (N=5) kept to slaughter age of 14 months of life. Bone length, bone weight and relative bone weight (RBW) were determined. Using quantitative computed tomography technique, cortical bone mineral density (Cd), mean volumetric bone mineral density (MvBMD), total bone volume (Bvol) and calcium hydroxyapatite density (Ca-HA) in the cortical bone were measured. Bone mineral density (BMD) and bone mineral content (BMC) were evaluated using dual-energy X-ray absorptiometry. Cortical bone area (CBA), cross-sectional area (A), second moment of inertia (Ix), mean relative wall thickness (MRWT) and cortical index (CI) were derived from the measurements of horizontal and vertical diameters of the investigated bones in the midshaft. Using three-point bending test, mechanical parameters of the bones (maximum elastic strength (Wy) and ultimate strength (Wf)) were determined. Bone weight, RBW, Bvol, BMD and BMC of tibia were significantly higher when compared with these parameters in femur and tarsometatarsus (P<0.001). Bone length reached the highest value in tibia than in tarsometatarsus and femur (all P<0.001). MvBMD was the highest in tarsometatarsus than in tibia and femur (all P<0.001). Ix reached the highest value in femur than in tibia and tarsometatarsus (all P<0.05). CBA and A were significantly lower in tarsometatarsus than in femur and tibia (P<0.01). MRWT and CI were significantly lower in femur than in tibia and tarsometatarsus (P<0.001). Wy and Wf of femur, tibia and tarsometatarsus were not significantly different (P>0.05). This study showed significant differences between morphological and densitometric parameters of the evaluated bones in male ostriches. Determination of morphological, densitometric and mechanical properties of femur, tibia and tarsometatarsus in male ostriches may serve as an attractive model for studies on metabolic regulation of skeletal system properties with environmental, physiological, dietary, pharmacological and toxicological factors.
Disclosure: The authors declared no competing interests.