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In order to determine the effects of adding different levels of Satureja khuzistanica essential oilin two conventional and microcapsulated forms into the diet on performance, immune response, blood biochemical parameters and intestinal morphology of broiler chickens, an exprement was conducted using 400 Ross 308 (mixed sex) broiler chickens, in five treatments, four replicates and 20 chickens per each replicate. The expriment was done in a completely randomized design. Treatments included control (no additive), dietary containing levels of 400 and 500 mg/kg Satureja essential oil and dietary containing levels of 0.5 and 1.00 percent capsulated Satureja essential oil. Adding different levels of Satureja khuzistanica essential oil in conventional and microcapsulated forms to diet of broiler chickens had no effect on feed intake,FCR, immune response and the number of white and red blood cells. However, experimental treatments containing conventional and microcapsulatedformof Satureja essential oil caused a significant decrease in body weight of the birds relative to than the control treatment. The level of thyroid hormones (T3 and T4) and blood biochemical parameters (cholesterol, triglyceride, HDL and LDL) were not affected by the experimental treatments. Although small intestin histologhy traits like width of villi, depth of crypt and length of villi to depth of crypt ratio were not affected by the experimental treatments, the level of 0.5 percent capsulated Satureja essential oil caused a significant decrease in length to width of villi ratio (P<0/05). Acccording to the results of the present experiment, using of two common and microcapsulated Satureja essential oil forms,  have not any  effect on performance, blood biochemical parameters and immune response.

This experiment was conducted to evaluate the effects of different levels of dietary crude protein (CP) on reproductive performance of native hens at Khorasan stations using 300 hens, in a completely randomized design with 6 dietary treatments and 5 replicates and 10 hens in each replicate from 26 to 50 weeks of age. Treatments based on corn, soybean meal and wheat with different levels of protein, including 17.5, 16, 14.5, 13, 11.5, and 10% CP levels and another nutrient including the energy was equal as possible. Results showed that the initial weight of chickens and the ratio of chicken weight to egg weight increased with CP levels upto 16% from the beginning of experimental period to 50 weeks and decreased with 17.5% CP level. The highest hatchability percentage in all periods was related to the 17.5% CP diet that showed significant difference with other treatments (P<0/05). Results on immune responses showed that treatment with 17.5 % CP, the highest titer of antibody against SRBC, IgG and IgM (P<0/05). In relation to cellular immunity (Test CBH) the result was slightly different and the highest cellular immune response to treatments containing 16% CP and higher levels of CP (17.5%) education compared to the treatment (16%). Overall, the results showed that reproductive performance and humoral immune response of native birds improved with increasing levels of CP.