There is a strong relation founded between growth and immune status of bird. Different additives in poultry feed is being tested to evaluate their effects on immune response of poultry bird. Among flavonoid the soya Isoflavone are also considered important for this purpose. A study was conducted to examine the effect of two different levels of dietary formononetin isoflavone as growth promoter on various economic traits, immune response, carcass yield and meat quality of broilers. This trial has produced very useful data & on the basis of this data it may be concluded that the isoflavonoid...