The effect of Rosemary (Rosmarinus officinalis L.) extract supplemented into broiler diets, on performance and blood parameters

This experiment was carried out to determine the effect of dietary supplementation of Rosemary (Rosmarinus

officinalis) ethanol extract, on performance and blood parameters of broilers. One hundred twenty 1-day-old male Ross308 broiler chicks were used in this experiment. The chickens were divided into 3 groups, including one control and 2

treatment containing 40 birds each. Each group was divided into four replicates and the study lasted 42 days. Group 1

(Control group) was fed with only basal diets. Group 2 (ROE 100mg/kg) was fed basal diet supplemented with 100

mg/kg R. officinalis L. Group 3 (ROE 200mg/kg), was fed basal diet supplemented with 200 mg/kg R. officinalis L. At the

end of experiment blood samples collected. Body weight gain (P<0.01) and feed consumption (P<0.001) were decreased

when compared with control group, while feed conversion ratio is not affected. Besides, it is detected that rosemary

ethanol extract increases the enzymes antioxidant (SOD, GPx, CAT), GSH; reduces lipid peroxidation (MDA) and reduces

the ALT, AST, blood glucose level (P>0.05) and LDL-cholesterol (P<0.01). The results of this study showed that lipid

peroxidation, oxidative stress parameters significantly decreased after ROE application. Rosemary (R. officinalis L.) ethanol

extract at 200 mg/kg administered group was found to create a more positive effect on some biochemical parameters

and can be a viable alternative growth promoter in the feeding of broilers.