The invention relates to a preparing method of a
feed additive, in particular to a preparing method of a pig
feed additive. The method includes the steps of mixing jasmine flower residues, wheat
bran,rice
bran and bean pulp, adding water to be evenly mixed to obtain a
solid culture medium, sterilizing the
solid culture medium for 30 min at 121 DEG C, cooling the
solid culture medium to 28-30 DEGC, inoculating the solid culture medium with a
saccharomyces rubrum seed solution and a
trichoderma longibrachiatum rifai seed solution, evenly mixing the materials, flat laying the materials on a shallow plate, placing the shallow plate in a manual climatic box to be cultured, conducting low-temperature
drying after culturing ends till the
water content is 10% or lower, conducting pulverizing through a
pulverizer to obtain fermented feed
powder, evenly mixing the fermented feed
powder,
chicken liver powder and feed-grade
bile acid, and conducting granulating and packaging to obtain a finishedproduct. The pig
feed additive is high in
palatability and has effects of promoting pig growth, improving pig
immunity and improving pig carcase quality.