The aim of the study was to evaluate the influence of the diet enriched with linseed on morphometric, densitometric and mechanical properties of tibio-tarsus and tarso-metatarsus in 14-month-old ostriches. The experimental diet including 4% of linseed was applied to ostriches (N=8) starting from the attainment of 45 kg of body weight, while the control birds (N=8) were fed the standard diet. At the age of 14 months of life, blood samples were collected and the birds were slaughtered to isolate left tibio-tarsus and tarso-metatarsus. Dual-energy X-ray absorptiometry method was used to evaluate the bone mineral density and bone mineral content. Using quantitative computed tomography, total bone volume, mean volumetric bone mineral density, volumetric bone mineral density of trabecular and cortical bone, cortical bone area, calcium hydroxyapatite density of the trabecular and cortical bone were also determined.Cross-sectional area, second moment of inertia, mean relative wall thickness and cortical index were determined. Maximum elastic strength and ultimate strength of bones were determined using three-point bending test. Total antioxidative capacity in the serum was measured using commercial photometric test. In the experimental group of males, cortical bone area reached significantly higher value, while calcium hydroxyapatite density of the trabecular bone of tibio-tarsus was significantly lower, when compared to sex-matched controls (P<0.05). In conclusion, the experimental diet enriched with 4% of linseed, starting from 45 of kg of body weight of birds, had neither the positive nor negative effects on the evaluated bone properties in 14-month-old ostriches. Thus, higher dietary dosage of linseed or different administration period of the experimental diet should be applied to expect effects on skeletal system quality in growing ostriches.
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