A biological experiment was conducted to study the effects of supplementation of nonencapsulated and encapsulated probiotic bacteria Lactobacillus lactis and Bifidobacter bifidum alone and their combination on broiler performance and blood biochemical parameters. The trial was carried out with 288 numbers of day old straight run broiler (Vencobb) chicks divided into eight treatment groups having six replicates of six birds each. Supplementing the birds with encapsulated bacteria especially in combination significantly (p<0.05) increased the body weight gain of the broiler chicken and improved feed conversion ratio from the second to sixth week as compared to nonencapsulated probiotic feeding.