342EFFECTS OF PROBIOTICS AND SYNBIOTICS ON GROWTH PERFORMANCE AND HAEMATO-BIOCHEMICAL PARAMETERS IN BROILER CHICKENSThe research was conducted to observe the effect of probiotics and synbiotics on growth performance (body weight gain, carcass percentage, average daily weight gain and feed conversion ratio), haematological parameters (total erythrocyte count, haemoglobin concentration and packed cell volume) and biochemical parameters (Urea, Uric acid, Creatinine, serum glutamic oxaloacetic transaminase and serum glutamic pyruvic transaminase) of broiler chickens.Twenty one, one-day-old broiler chicks (Shaver starbro) were assigned to 3 treatments (7 birds/ treatment). Treatment groups were: Control diet without synbiotics or probiotics (Group A), with probiotics (Gut-pro®) (Group B), with synbiotics (TGI®) (Group C). Chicks were reared for 35 days. Body weight gain was increased significantly (p<0.05) in birds supplemented synbiotic compared with control and probiotic treated group. The synbiotic supplemented group had increased (p<0.05) carcass percentage compared with the control group and probiotic supplemented group. However, the carcass percentage did not show significant differences between the control group and probiotic supplemented group. Packed cell volume increased (p<0.05) in synbiotic and probiotic treated group. Urea, uric acid and creatinine concentration increased significantly (p<0.01) in synbiotic supplemented group. No significant (p>0.05) difference was found for serum glutamic oxaloacetic transaminase but serum glutamic pyruvic transaminase value increased significantly (p<0.01) in both probiotic and synbiotic treated groupmehedivet@gmail.comResearch5102015Broiler,Probiotics,Synbiotics,Haematological Parameter,Biochemical parameterKhondokar Sagor Ahmed,Mehedi Hasan,Md. Asaduzzaman,Afia Khatun,Kamrul IslamDepartment of Physiology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.,Department of Animal Science, EXIM Bank Agricultural University Bangladesh, Chapainawabganj-6300, Bangladesh.,Department of Physiology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.,Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi-6205, Bangladesh,Department of Physiology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.