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چکیده
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The aim of the study was to analyze how application of per os licorice extract (LE) (Glycyrrhiza glabra) and colloidal nano silver (CNS) affect the safety Indicators of ross broiler chickens in both embryonic and growth period. In Embryonic period Eight hundred Fertilized commercial eggs were randomly assigned to one of 10 treatments with five replicates (20 eggs each replicate). This experiment was arranged based on a completely randomized design (CRD). First group was control (without injection), second group was control (0.1 cc injection of Sterilized distilled water) and groups from third to ten were included 0.1 cc injection both LE in three levels (0, 100 and 200 ppm) and CNS in three (0, 30 and 60 ppm), in form of alone and combination with each other. For Growing period after hatch, the best treatments in first step were choosed and transferred to this step. Treatments consisted of two control groups from first step and other group treated in diet with both LE in three levels (0, 1 and 2 gr/kg) and CNS in two levels (0 and 120 ppm) in form of alone or combination with each other and a group treated with antiobiotic. Antibody response to Newcastle disease was significantly high in the group has been treated with 60 ppm CNS and 200 ppm LE (P<0.05). At the 42 days of age the highest antibody response belonged to 1gr/kg LE and 2gr/kg LE treatment (P<0.05) and antibiotic treatment had the lowest antibody response. These results consistented with the previous report Khaligh et al. [1]. Was observed positive effects on WBC count. The level of 60 ppm CNS and levels of 100 and 200 ppm LE combined with each other had much more affirmative effect on Lymphocytes percent than other treatment (P> 0.05) in agreement with Baseer et al. And Moradi et al. [2,3]. In the present study none of these organs (bursa, spleen, Thymus) were affected significantly (P> 0.05) by treatments. These results were consistent with those of the study by Sedghi et al. [4]. Kalantar et al. [5] re
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