The objective of this study was to evaluate the effects of genetically modified (GM), insect resistant corn (MON 810) and glyphosate tolerant soybean meal (Roundup Ready, MON 40-30-2), used as the main dietary components, on physico-chemical properties of broilers’ breast and thigh muscles. The pH and water holding capacity values of breast and thigh muscles indicated no statistically significant differences between broilers fed diets containing non-transgenic or transgenic feeds. Results for the oxidation reduction potential measurements of the breast muscles from the group fed GM corn and non-modified soybean meal as well as muscles of female chickens from the group fed GM corn and GM soybean meal were significantly lower than those for other dietary treatments. The results of presented study showed that chickens, which had consumed transgenic diet exhibited improved lipid stability of breast and thigh muscles, as indicated by TBARS values. The use of transgenic corn or soybean meal did not cause significant changes in colour parameters L* and b*. Incorporation of transgenic corn and soybean meal into broilers diet significantly affect the a* colour parameter for breast muscles.