The invention discloses a
feed additive for a laying hen. The
feed additive comprises the following components by weight percent: 65-75wt% of flaxseed cake, 9-12wt% of lucid
ganoderma, 8-10wt% of vinolevure, 3-6wt% of
streptococcus faecium and 5-7wt% of viametto, wherein the flaxseed cake is subjected to detoxification treatment; the total
mass fraction of linamarin, lotaustraline, beta-
gentiobiose neolinustatin and beta-neolinustatin in the detoxified flaxseed cake is smaller than 20mg / kg; and the additive is evenly mixed into an edible feed for the laying hen by 0.4-0.5wt%. According to the
feed additive, the
immunity of the laying hen can be improved, the genital
system function of the laying hen is enhanced, the laying rate and the egg weight are increased, the nutritive value of the feed can be improved, the
yolk colors of egg products are increased, the
eggshell quality is increased, the health of chicken flocks is ensured, application of
antibiotics,
hormone and the like in the laying hen feed is effectively reduced, the safety of egg products is improved, and the feeding benefits are improved.