The experiment was conducted to evaluate the effect of inclusion of dried fermented post-extracted rapeseedmeal to the diet of pregnant sows (using 20 pregnant sows in total) on bone development in offspring. In onetreatment group (n= 10 sows), the soybean meal in the diet of pregnant sows was partially replaced with driedfermented rapeseed meal (40 g/kg) during the whole pregnancy up to parturition. All newborn boars, a total of45 in each treatment group, were grown up to the end of starter phase at the age of 77 d. Then, one boar fromeach sow (n= 10) was selected to be sacrificed. Dried fermented rapeseed meal included in the sow diet resultedin longer (P= 0.006) and heavier (P= 0.036) femur in their offspring. Maternal dietary supplementation ofdried fermented rapeseed meal increased relative bone volume (P= 0.024) and trabecular number (P= 0.006)and decreased trabecular space (P= 0.007) in femoral epiphysis as well as increased the thickness of hyalinecartilages increased (P< 0.001). The 3-point bending test showed increase in bone mechanical strength (yieldand ultimate load, stiffness, elastic energy, and work to fracture;P< 0.05) in boars maternally supplementedwith dried fermented rapeseed meal. However, material properties (Young's modulus, yield, and ultimate strain)of bone did not differ between treatments, which was a result of the changes in bone mid-diaphysis's geometry.Although the quantitative indicators of bone mineralization did not differ between treatments, the maternal dietchanged the structure of mineral phase of bone, as X-ray diffraction analysis shown the decrease of the mean sizeof the hydroxyapatite nanocrystallites (P< 0.001) in boars maternally supplemented with dried fermentedrapeseed meal. This could be the effect of ionic substitutions of Ca ions in the hydroxyapatite structure, as thecontent of macro- and microelements in ashed bone samples was different in treatment groups. Based on theresults, it can be concluded that inclusion of dried fermented rapeseed meal to the diet of pregnant sows im-proved the structure and mechanical properties of compact bone in the mid-diaphysis and microarchitecture oftrabecular bone in metaphysis and epiphysis of the examined bones in their offspring at the beginning of thegrower period.