The invention discloses an application of alpha-
ketoglutaric acid and alpha-ketoglutarate taken as a
feed additive capable of improving pig carcass composition or in preparation of the
feed additive capable of improving the pig carcass composition. The improvement of the pig carcass composition refers to increase of a pork loin area, pig slaughtering rate and pig
lean meat percentage and decrease of fat deposition, pig backfat thickness and / or pig
abdominal fat weight. The study shows that by addition of alpha-
ketoglutaric acid (or alpha-ketoglutarate) to pig feed, the pork loin area and the
lean meat percentage can be remarkably increased, meanwhile, the fat deposition level is reduced, and the energy redistribution effect is realized. Besides, alpha-
ketoglutaric acid (or alpha-ketoglutarate) does not have any adverse
impact or toxic and side effects on pig growth performance and health, so that the pig feed capable of improving the pig carcass composition is prepared and the breeding benefit is increased on the premise that the growth is not limited in a pig raising process. Meanwhile, alpha-ketoglutaric acid (or alpha-ketoglutarate) and the additive thereof can be directly added to a premix compound and are convenient and fast to use, the preparation method is simple, requirements for special equipment are avoided, and good popularization and application prospect is realized.