Effect of Dietary Supplementation of Probiotics on Performance, Caecal Microbiology and Small Intestinal Morphology of Broiler Chickens

摘要

An experiment was conducted to determine the effects of dietary supplementation of different probiotics (Lactobacillus acidophilus, Bacillus subtilis and Saccharomyces cerevisiae) on growth performance, nutrient retention, caecal microbiology and intestinal morphology of broilers. Three hundred twenty day-old broiler chicks (Ross) were randomly allotted to 1 of 4 treatments on the basis of body weight in a randomized complete block design. Each treatment was comprised of 4 replicates with 20 chicks in each. Experimental diets were fed in 2 phases, starter (d 0 to 21) and finisher (d 22 to 35). Dietary treatments were basal diet without any probiotic (Control) and basal diet supplemented with 0.30% of Lactobacillus acidophilus (LA), Bacillus subtilis(BS) and Saccharomyces cerevisiae (SC). Supplementation of LA, BS and SC to broilers diets improved (P<0.05) feed intake, BW gain and digestibility of CP and GE (d 21 and 35), DM (d 35) than broilers fed control diet. Moreover, birds in treatments LA, BS and SC showed better (P<0.05) overall FCR compared to control. At d 35 birds in treatments LA, BS and SC showed decrease (P<0.05) in caecal Clostridium and Coliform count than control. Villus height of duodenum and villus height:crypt depth ratio of ileum were increased (P<0.05) in treatments LA, BS and SC as compared to control. Result obtained in present study indicates that L. acidophilus, B. subtilis and S. cerviciae at 0.30% level of inclusion improved nutrient digestibility, caecal microbial balance and intestinal morphology of broilers.