Effects of Vaccination Routes Against IB on Performance and Immune Responses of Broiler Chickens

Abstract

Vaccination is often considered as an appropriate option in prevention most of poultry viral diseases worldwide. This study was conducted to evaluate effects of current routine vaccination routes (spray, eye-drop and drinking water) of live vaccines against infectious bronchitis (IB) on performance and humoral immune responses of broiler chickens. The results of this study indicated that Vaccination significantly (P< 0.05) affects performance of the broiler chickens and effects on weight gain and FCR, did not differed significantly among these routes. Immune responses of vaccinated chickens were significantly (P< 0.001) differed from those of control chickens. Comparison of various vaccination routes revealed that eye-drop group had the highest antibody titer with the closest range. There were also positive significant (P< 0. 01) degrees of correlation among chickens vaccinated with spray and eye-drop, spray and drinking water, eye-drop and drinking water (r = 0.84, r = 0.80 and r = 0.82, respectively). In conclusion, eye-drop method induced the highest antibody titers with the closest range.