An object of the present invention is to provide a feed additive composition for ruminants containing not less than 30 wt% of a biologically active substance, which is of a dispersion type, has high protection in the rumen, and is also superior in dissolution in the lower gastrointestinal tract.The present invention relates to a feed additive composition for ruminants containing (A) at least one selected from hydrogenated vegetable oil and hydrogenated animal oil each having a melting point of higher than 50°C and lower than 90°C, (B) not less than 0.05 wt% and not more than 6 wt% of lecithin, (C) not less than 30 wt% and less than 65 wt% of a biologically active substance, (D) not less than 0.01 wt% and less than 0.8 wt% of a natural vegetable oil, and not less than 0.1 wt% and less than 6 wt% of water.
