Feed additive composition for ruminants

The purpose of the present invention is to provide a feed additive composition for ruminants, the feed additive composition being highly protective in the lumens and exhibiting excellent dissolution in the gastrointestinal tract. The present invention pertains to a feed additive composition for ruminants containing (A) at least one selected from a hydrogenated vegetable oil and a hydrogenated animal oil, which have a melting point higher than 50°C and lower than 90°C, (B) lecithin, (C) a biologically active substance, (D) a natural vegetable oil, and water, the feed additive composition being characterized in that when a scattering profile is measured by a small angle/wide angle X-ray scattering method after holding the composition at 40°C for 15 minutes, and then is measured again after further holding the composition at 40°C for 30 minutes, the ratio (t/s) of the peak intensity (t) when the composition is held at 40°C for 45 minutes to the peak intensity (s) when the composition is held at 40°C for 15 minutes is 0.9-1.1 for a peak having a maximum peak intensity in a region in which the scattering angle 2θ is 5° or less, and the ratio (y/x) of the peak intensity (y) when the composition is held at 40°C for 45 minutes to the peak intensity (x) when the composition is held at 40°C for 15 minutes is 0.7-0.9 for a peak having a maximum peak intensity in a region in which the scattering angle 2θ is 17-23°.