Meat quality of livestock and poultry is a comprehensive evaluation of the physical and chemical characteristics of meat.However,heat stress is one of the main factors contributing to the deterioration of meat quality in livestock and poultry.Intestinal flora has the function of influencing nutrient digestion and absorption,metabolism and immunity of the animals.Bile acids promote the digestion and absorption of fat and fat-soluble substances,and act as signaling molecules to regulate the metabolic activities of the organism.They regulate each other,the intestinal flora participates in the modification process of bile acids,and bile acids can regulate the composition of the intestinal flora.The interactions between the intestinal flora,bile acids and their recep-tors from the"intestinal flora-bile acid"axis,which regulates many physiological processes such as carbohy-drate,lipid and energy metabolism,and may further affect meat quality.A large number of studies show that the decline in performance of heat-stressed livestock and poultry is related to the dysregulation of intestinal flora and bile acid metabolism,but the relationship between heat stress and the"intestinal flora-bile acid"axis is not clear enough.This review summarized the effects of heat stress on the meat quality of livestock and poultry,the relationship between the"intestinal flora-bile acid"axis and heat stress,and the possible mechanisms to im-prove the degradation of meat quality caused by heat stress through this axis.It also provided a solution to the deterioration of meat quality in livestock and poultry due to heat stress.[Chinese Journal of Animal Nutrition,2024,36(1):55-63]
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