The invention relates to three major types of
bacteria mixed liquid
fermentation,
solid yeast feed additive and a preparation method thereof and belongs to the field of microbial
fermentation. The mixed
bacteria yeast is prepared from
lactic acid bacteria (five types of strain),
saccharomycetes (three types of strain) and bacillus (six types of strain) in a mixing and fermenting mode. The preparation method for the mixed bacteria
yeast feed additive includes that firstly, cultivating into mother strain through
test tube slant culture medium and
test tube fluid medium; secondly, performing shaking table
oxygen consumption culture, slant
solid culture and anaerobic triangular flask culture, and fermenting into liquid
feed additive in a
fermentation tank or inoculating to
solid fermentation to form the feed additive after fermenting in the fermentation tank. The mixed bacteria yeast feed additive prepared by the method is natural, safe, environmental friendly, rich in
metabolite, high in nutritive value and capable of providing the
probiotic group needed for the intestines and stomachs of
livestock and poultry, preventing diseases, improving the
immunity of the
livestock and poultry, reducing the harmful gas emission of the
livestock and poultry and improving the environment of livestock and poultry houses. The preparation method is simple in culture medium prescription, capable of saving the production cost and lowering the fermentation
energy consumption, high in fermentation yield and good in product quality.