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A t otal of 100-day-old broiler chicken were randomly divided into five groups and kept under elevated temperature (95-98.6 F) to observe the effect of potassium chloride and sodium bicarbonate on the o weight gain, feed conversion ratio (FCR), serum potassium and serum bicarbonate level. Thermostress lead to significant in decrease (P

This study was undertaken to evaluate the effects of probiotics (Protexin) on the immune response of broiler chicks. The parameters of investigation were hemagglutination inhibition HI titer of antibodie s against avian influenza virus and post field AIV challenge. The findings were compared with the cyclophosphamide treated AIV-vaccinated; untreated and AIV-vaccinated and unvaccinated and control birds this investigation revealed that protexin treated chicks have higher AIV-HI antibody and no AIV post challenge mortality compared to the cyclophosphamide treated and untreated chicks the overall finding of this study clearly demonstrate that the use of this multistrain probiotics has good effect on immune response of broiler chicks.