Research on the Solid State Fermentation Medium of Yeast Culture Additive

[Objective]The purpose was to provide some references for preparing a new type of additive for cow feed.[Method]The solid state fermentation media with different C-N ratios were prepared by different C and N sources according to some proportions.With activated diluent solution of Fubang feeding dry yeast with high activity as tested material,the optimum C and N sources and C-N ratio were confirmed through fermentation culture and determination of yeast cell number.[Result]Among 6 solid state fermentation media with different C-N ratios,the yeast cell number in the fermentation medium with straw as C source was generally higher than that with corn starch as C source.With straw as C source,peanut meal as N source,C-N ratio of 1∶1,the yeast cell number in per gram dry matter of fermentation medium was 1.283×109.With mixture of straw and corn starch(2∶1) as C source,the yeast cell number in per gram dry matter of fermentation medium was 1.315×109.[Conclusion]The optimum C and N sources and their ratio for the solid state fermentation of Fubang feeding dry yeast with high activity were mixture of straw and corn starch(2∶1),peanut meal and 1∶1 resp.