Effects of yeast and yeast extract on intestinal microbiota of  Litopenaeus vannamei
An 8-week trial was conducted to evaluate the effects of yeast and yeast extract on growth performance, anti-oxidant ability and intestinal microbiota of Litopenaeus vannamei. Five diets supplemented with 0 % (Control), 3% beer yeast (Y), 0.5% yeast extract (YE0.5), 1% yeast extract (YE1) and 2% yeast extract (YE2) respectively were fed to shrimps. The objectives of this study were: 1) to investigate the effects of yeast and yeast extract on growth performance, proximate compositions, anti-oxidative ability of L. vannamei; 2) to explore the composition and diversity of intestinal microbiota in shrimp effected by yeast and yeast extract; and 3) to compare the application effects of yeast and yeast extract in aquaculture.