Abstract
The objective of this study was to investigation effect of different of probiotic BIOSAF supplementation on the effect of different levels of probiotic BIOSAF on growth performance and immune system response of male Ross 308 broiler. Two hundred twenty five chickens were allocated in the three treatment containing 5 pen and 15 birds on each pen. Diets included 0, 1 or 1.5gr of probiotic BIOSAF/kg diet and considered as control, treatment1 and treatment 2, respectively. On day 20 and 35 of age, birds were injected (i.m) with 0.1 mg of 0.5% sheep red blood cells (SRBC). Antibody production against SRBC was measured after 7 days of inoculation. On the day 10 of age, the chicks were vaccinated against Newcastle disease virus (NDV Generally, usingprobiotic BIOSAF per kg diet has efficient effect on growth performance of male Ross chekien particularly, when supplementation is done in starter period. Also, supplementation probiotic BIOSAF has positive effect on immune response to Newcastle and SRBC. However, 1gr/kg supplementation of probiotic BIOSAF is more suitable than 1.5gr/kg diet.
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