effect of prebiotic (saccharomyces cerevisiae cell wall) on performance, carcass traits and intestinal morphology in broilers

this experiment was conducted to investigate the effect of different levels of saccharomyces cerevisiae cell wall on performance, carcass traits and intestinal morphology in broilers. in this experiment 240 ross- 308 broilers were used in 4 treatments, 5 replicates and 12 bird in each replicate in a completely randomized design for 42 days. the treatments included: 1) control group (without saccharomyces cerevisiae cell wall, (in treatments 2, 3 and 4 the amounts of saccharomyces cerevisiae cell wall were 0. 5, 1 and 1.5g/kg. weight gain, feed intake and feed conversion ratio were measured periodically. in 28 and 42 days of experiment period, 2 bird from each replicate for measure of carcass traits and intestine morphology randomly selected and slaughtered. the experimental treatments significantly affected the performance, carcass traits, and intestinal morphology of broilers in 28 and 42 days of experiment period (p<0.05). the best results were obtained by using 1.5 g/kg of saccharomyces  cerevisiae cell wall in diet. different levels of saccharomyces cerevisiae cell wall did not have any significant effects on size of liver, spleen and bursa of fabricuse (p>0.05). the overall results showed that in broilers using 1.5 g/kg of saccharomyces cerevisiae cell wall in diet improve their performance, carcass traits and intestinal morphology