The effect of essential oil encapsulated oregano, oregano oil, probiotic and antibiotic on performance, carcass characteristics and immune system parameters of broiler chickens

An experiment was conducted to investigate the effects of probiotics, antibiotics, oregano oil and encapsulated oregano oil on performance, carcass characteristics and safety of Arian broiler chicks. A total of 625 broiler chicks Arian in a completely randomized design with 5 treatments and 5 replicates were tested at the age of 1 to 42 days. Treatment include: 1- basal diet (negative control),2- basal dietꚺᮊ譢(0.1kgProtexin),3- basal diet橻扮⨭ (0.15kgAvilamycin),4- basal dietꊷꁪ oil(0.2 /kg) and 5- basal diet穷᪦쮥櫗 oregano oil(1 g per kg).The results showed, using encapsulated oregano oil had no significant effects on bird weight, feed intake and survival index(P>0.05).Experimental groups had no significant effects on carcass and leg percentage (P>0.05), but its effects on breast percentage had tend to be significant (P=0.07).The effects of treatments on SRBC response and immunoglobulin G (p=0.09)unlike immunoglobulin M tend to be significant. The use of probiotics, antibiotics, oregano oil and encapsulated oregano oil had no significant effect on the level of white blood cells (P>0.05). According to result, using oregano oil in the form of encapsulation had no significant effect on performance traits, carcass characteristics and immune responses, but these effects were higher numerically in this group in comparison to using ordinary form of it, so higher investigation in the case of using oregano oil in the form of capsulation will be suggested