Effects of saccharomyces cerevisiae yeast on digestibility of finishing diets, ruminal and blood metabolites in sheep

The saccharomyces cerevisiae yeast supplementation on sheep diet could be used. The aim of this study was to investigate effects of saccharomyces cerevisiae yeast on digestibility of finishing diets, ruminal and blood metabolites in sheep. Fifteen Ghezel-Baluchi male sheep with average age of 1 year and initial body weight of 40±4 kg were used in a completely randomized design with three treatments and five replicates. Experimental diets were 1) basal diet without yeast (control), 2) basal diet +3g yeast, 3) basal diet+6g yeast per head (sheep) per day. Total feces were collected to determine digestibility in the last 7 days of experiment and in the last day of experiment, blood samples at 2 hours after morning feeding by venogecte tubes and rumen fluid were collected at 2 hours after morning feeding by stomach tubes. Results of experiment indicated that Saccharomyces cerevisiae yeast improved digestibility of dry matter, organic matter, crud protein, neutral detergent fiber and acid detergent fiber of basal diet (P <0. 05). also total volatile fatty acids and pH of rumen fluid increased and ammonia nitrogen of rumen fluid and cholesterol, triglyceride and urea of blood were decreased by yeast addition (P<0.05).Rumen ciliate protozoa counting showed that yeast had influence on biological diversity of protozoa and increased protozoa population in rumen. Results of this experiment indicated that yeast Saccharomyces Cerevisiae improved microbial ecosystem and rumen fermentation conditions.