The present invention is double-coated with hydrogenated oil, beta-carotene and choline so that β-carotene (beta-carotene), a kind of carotenoid-based vegetable pigment, is not decomposed in the rumen of ruminants and stably moves and absorbs into the lower digestive organs after the duodenum. A feed additive composition for increasing the fertility rate of a ruminant comprising a mixture of a derivative and an absorption aid, a method of preparing the composition, a feed for a ruminant comprising the composition, and feeding the composition or feed to a ruminant It relates to a method of increasing the fertility rate of ruminants. The feed additive composition for increasing the fertility rate of ruminants provided by the present invention is double-coated with hydrogenated oil and is not decomposed even in the rumen of the ruminant, and is absorbed in the small intestine of the ruminant due to the absorption aid contained in the composition, and the fertility rate of the ruminant As can be improved, it will be widely used for efficient breeding of various ruminants.
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