The Investigation of Intestinal Microflora and Growth Response of Young Broilers Given Feed Supplemented with Different Levels of Peobiotic and Prebiotic

摘要

Effects of a probiotic (PRIMALAC) and a prebiotic (FERMACTO) on performance, ileum and crop microbial flora and carcass characteristics have been examined on 480 1 day old Ross 308 broiler chicks. The experiment carried out in a factorial design including three levels of FERMACTO (0, 1 and 2 g ton-1) and two level of Perimalac (0 and 900 g ton-1). Each of treatment was allocated to 5 replicates of 16 male broilers and reared for 42 days. The microflora population in crop and ileum parts was measured on appropriate bacteriological media. Results of experiment indicated that application of primalc (900 g ton-1) significantly improved body weight gain and feed conversion ratio (p<0.01). Feed consumption and feed conversation ratio were not affected with supplementation of different levels of FERMACTO. The percent of carcass, thigh, breast and abdominal fat were not affected by treatments. Coliform counts in the ileum of birds receiving PRIMALAC (900 g ton-1) and FERMACTO (2000 g ton-1) were significantly lower than those of the control birds (p<0.05). Different levels of PRIMALAC or FERMACTO had no effect on total bacteria counts in the ileum and crop parts. In 3rd week of rearing periods, the highest significant (p>0.05) value of lactobacilli population was recorded for broilers fed diet supplemented with PRIMALAC (900 g ton-1) but different levels of FERMACTO relatively increased lactic acid bacteria population in crop. The results of present study revealed that these feed additive by acting on microbial population of digestive system significantly (p<0.05) affects broiler performance.