AbstractOpoka is a silica-calcite sedimentary rock chemically and structurally similar to diatomaceous earth (DE), composed mainly of silicon dioxide (SiO2), calcium carbonate (CaCO3), amorphous SiO. Opoka occurs predominantly in South Eastern Europe and Russia. Due to these specific properties investigation on the effect of opoka-enriched diet on chemical composition and overall quality of breast and leg muscles of broilers was initiated. Working samples showed a statistically significant increase in ash content or water content and a decrease in lipid content in the leg muscles of both male and female broilers (P<0.01). Furthermore, the addition of opoka to the diet increased WHC of leg muscles in females and hardness or chewiness of these muscles in both genders (P<0.05). The supplementation of broiler diet with opoka can be effectively applied to modify texture features of leg and breast muscle tissue which might, in turn, serve to regulate the nutritional and technological value of chicken meat.
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