Document Type : Research Paper


1 M. Sc. Student, Faculty of Agriculutre & Natural Resources, University of Arak, Arak, Iran

2 Assistant Professor, Faculty of Agriculutre & Natural Resources, University of Arak, Arak, Iran

3 Associate Professor, Faculty of Agriculutre & Natural Resources, University of Arak, Arak, Iran


This experiment was conducted to evaluate the effect of pure thyme essential oil and capsulated form on performance, carcass traits yields, feed intake, blood metabolite, in broiler chicks. This experiment was conducted in a completely randomized design with 4 treatments, 4 replicates and 12 broiler chicks per each replicate. The experimental treatments were 1) basal diet 2) basal diet + 200 ppm thyme essence 3) basal diet + 200 ppm encapsulated thyme essence 4) basal diet + 100ppm encapsulated thyme essence. Body weight, feed intake and feed conversion were measured at the end of each experimental period. 10d body weight was significantly different between control and other treatments (P<0.05). Body weight at 24 d of age, in thyme essence and 100 ppm encapsulated thyme essence groups, were different from control group (P<0.05). Overall Feed conversion ratio was significantly different between 100 ppm encapsulated thyme essence group and control group. There were no significant differences in gizzard, abdominal fat, bursa of fabricius, and thymus and spleen relative weight in between experimental treatments. Serum glucose, triglyceride, HDL, LDL, VLDL cholesterol did not showed any significant differences among treatments. Serum cholesterol content was significantly different (P<0.05) and all treatment with any form of essence had lower cholestrol content than control group. Based on our results, it can be concluded that 100 ppm encapsulated thyme essence group had better performance parameters in compared to control group. Encapsulation can increase efficiency so with lower amount of thyme essence similar performance to 200 thyme essence treatment was obtained.


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