The present invention discloses a pregnant sow feed and a preparation method thereof, and relates to the technical field of pregnant sow feed preparation, the pregnant sow feed comprises 95-97% of a basic ration, 1-2% of combined fibers and 1-3% of a composite additive; the basic ration is prepared from the following components in percentage by
mass: 30 to 35 percent of corn, 12 to 16 percent of
soybean meal, 15 to 18 percent of
broken rice, 18 to 22 percent of
triticale, 8 to 12 percent of rice
bran meal, 10 to 15 percent of wheat middling, 1.0 to 1.2 percent of mountain flour, 0.8 to 1.0 percent of
calcium hydrophosphate, 0.3 to 0.5 percent of
sodium chloride, 0.08 to 0.12 percent of
lysine, 0.04 to 0.06 percent of
threonine and 0.1 to 0.15 percent of
choline chloride; the composite
fiber comprises the following components in percentage by
mass: 45-65% of sweet potato stem and leaf
fiber, 20-35% of alginate
fiber and 10-25% of konjaku flour. Compared with a single
feed additive or simple superposition thereof, the
feed additive disclosed by the invention has better performance in the aspects of immunological enhancement,
nutrition utilization, reproductive performance and the like through the synergistic effect of the components, can simultaneously solve various problems in the breeding of pregnant sows, and provides an efficient and safe feed scheme for the pig raising industry.