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In this study the effect of microencapsulation of thyme and cinnamon essential oils on performance, some blood parameters and carcass characteristics of broiler chicks were investigated. For this purpose 320 male broiler chicks from 308 strain in four treatments and 4 replications in a completely random design were tested for a period of 42 days. The treatments included basal diet+antibiotic, basal diet, basal diet+free thyme essential oil , basal diet +microencapsulated thyme essential oil, , basal diet+free cinnamon essential oil, basal diet +microencapsulated cinnamon essential oil, basal diet+free thyme and cinnamon essential oils, basal diet +microencapsulated thyme and cinnamon essential oils. Results the study showed that the treatments had no significant effect on performance traits consist of feed intake, body weight gain and feed coefficient rate (P> 0.05).The result of blood parameters showed that adding essential oil to diet, significantly reduced cholesterol concentration. Adding free cinnamon significantly increased HDL concentration and the treatment include microencapsulated thyme and cinnamon had the most glutathione peroxides enzyme activity (P< 0.05). Study of carcass characteristics showed that the treatment of diet without additives had significantly highest weight of liver and abdominal fat compared with the other treatments (P< 0.05). Generally the results of this experiment showed positive effects of microencapsulated essential oils on reduction of cholesterol concentration, enhancement glutathione peroxides enzyme activity and reduction of liver and abdominal fat weight on broiler chicks.

The Effect of Thyme and Cinnamon Microencapsulated Essential Oils on Performance, Some Blood Parameters and Carcass Characteristic in Boiler Chicks