The immune response of broiler chickens fed diets supplemented with propolis and digestarom ® under heat stress condition

الملخص EN

This research was carried out to evaluate the effect of dietary supplementation of a mixture of propolis and phytogenic (Digestarom® )on immune responses against Newcastle disease (ND) and infectious bursal disease (IBD), also Heterophil/lymphocyte ratios (H/L)in vaccinated broiler under thermoneutral(TN) (maintained on usual heat program)and heat stress maintained in )33 ± 2°C).A total of three hundred, one-day-old broilers (Rose 308) chicks were distributed equally in two separated room, TN groups and HS groups along the duration of the experiment (42)day, then each group subdivided in to five treated group( 30 chicks each group) treated as follow: (TG1 andHG1)fed a basal diet supplemented with propolis (2g/kg of diet), (TG2 and HG2)fed Digestarom®(150mg/kg).(TG3 and HG3) fed a mixture of (propolis2g/kg +Digestarom®150mg/kg) and two control groups without additive.

Antibody titers against ND and IBD were measured and H/L ratio was estimated.

In HS chickens the results revealed a significant decrease(P<0.05)in immune response with significant increased(P<0.05) in H/L ratio, while higher significant (P<0.05)in antibody titers with significant decrease (P<0.05) in H/L ratio was showed in all TN chickens but more significant in TG3 and HG3 groups were gave the best values in comparing with others groups.

The role of Propolis or phytogenic on broiler health and immunity had already been reported, but in this study was reported the effects of their mixture on ameliorating the deleterious effects of heat stress.