Saccharomyces cerevisiae strain:GSF12 Genome sequencing and assembly. Saccharomyces cerevisiae strain:GSF12

Saccharomyces cerevisiae is a yeast strain often used to improve the feed quality of ruminants. However, S. cerevisiae is limited to providing biomass when inoculated with carbon sources and has a low ability to produce cellulase enzymes. Therefore, this study aimed to isolate and classify yeast from the rumen fluids of goats, silage fluid, rotten grapes, and commercial yeast (control), and the efficiency of yeast biomass production and cellulase activity was determined. Twenty-six isolates were obtained and the eleven isolates were similar to yeast by morphology determination. The biomass production was carried out by cultivating each strain in a fermentation medium composing sugarcane molasses at 25% plus 1% urea and pH 3.5. The result found that all yeast strains can grow in this medium. GFS12 had higher biomass than yeast isolated from commercial yeast powder