This invention provides the application of a *Breago brevis* strain in the preparation of products that promote
intramuscular fat deposition in
livestock and poultry. The *Breago brevis* strain is *Breago brevis* JCM 32280. Under high-
fiber dietary conditions, supplementation with *Breago brevis* JCM 32280 of this invention can efficiently degrade
fiber to produce high concentrations of
butyrate.
Butyrate, as a key
effector molecule, can directly bind to and activate PPARγ receptors in host cells, thereby upregulating the MOGAT2-mediated
triglyceride synthesis pathway, significantly increasing
body fat percentage in mammals and promoting
intramuscular fat (marbling). Simultaneously, this strain can reshape the intestinal
microecology, specifically increasing the abundance of beneficial intestinal lactobacilli and enhancing the intestinal
mucus barrier, providing a safe and efficient microbial preparation strategy for improving the fat deposition capacity and
meat flavor of
livestock and poultry.