EFFECT OF YEAST (Saccharomyces cerevisiae) BASED PROBIOTIC ON THE GROWTH PERFORMANCE OF BROILER

A Thesis Submitted to Department of Animal Nutrition, Genetics and Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207 in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS)INANIMAL NUTRITION SEMESTER: JULY-DECEMBER, 2019

A total of 120 day-old Lohmann Meat (Indian River) broiler chicks were reared at Sher-e-Bangla Agricultural University Poultry Farm, Dhaka. The present study was designed to evaluate the productive performance of commercial broiler chicks fed diet containing yeast based probiotics compared to basal diet. The aims of the present study were to investigate the influence of a yeast based probiotic on the growth performance of broiler, body weight, feed intake, FCR, carcass merits of male and female broiler were compared to control feeding of broiler. A total of 120 day-old Lohmann Meat (Indian River) chicks were used in this experiment. Chicks were divided randomly into 5 experimental groups of 3 replicates (08 chicks with each replication). Among the 5 experimental groups one group were fed this diet as control and another one antibiotic mixed feed, the remaining three groups were fed diet mixed with 3 categories of yeast based probiotics. Here this study T = (antibiotic 0.25g/kg feed), T 2 = (probiotic 1.5g/kg feed), T 3 1 = (probiotic 2 g/kg feed), T = (probiotic 2.5g/kg feed) and T = (control). The duration of experimental work was 28 days. Results of the experiment showed that addition of yeast based probiotics improved (P<0.05) broilers growth performance and the impact starting from the third and the fourth week of the feeding trial. However, it increased the effect on feed intake. Feed conversion ratio was better and dressing percent was increased (P<0.05) in birds fed diets supplemented with yeast based probiotics. Yeast based probiotic supplementation had no significant effect on broiler carcass cuts compared to control. The study therefore concluded that yeast based probiotic supplemented with 2g/ kg of the broiler feeds proved to be beneficial for increasing the growth performance of broiler. 0 4