Lipo-nutritional quality of pork: The lipid composition, regulation, and molecular mechanisms of fatty acid deposition

Pork is one of the main meats consumed by people, and its nutritional value is closely related to human health. The lipid deposition and composition of pork not only affect the sensory quality but also determine the nutritional quality of pork. The lipids in pork include triglycerides(TAG) and a small amount of cholesterol and phospholipids. TAG are the main lipids in skeletal muscle fat, which is divided into intermuscular fat and intramuscular fat(IMF). In addition to TAG, IMF also contains phospholipids,which are important factors affecting pork flavour. There are three types of fatty acids in TAG: saturated fatty acids(SFA), monounsaturated fatty acids(MUFA), and polyunsaturated fatty acids(PUFA). PUFA,such as n-3 PUFA, have a beneficial effect on health, including the regulation of whole-body energy metabolism and protection against cardiovascular diseases. Therefore, regulating lipid deposition,especially the fatty acid composition, in pork is important for improving the nutritional quality for human health. Notably, several strategies, such as breeding, environmental control, and the nutritional regulation of lipid composition and deposition in pork, have been studied. More recently, faecal transplantation, molecular design breeding and non-coding RNA have been studied and proven useful for regulating lipid deposition in pigs. In this review, we mainly summarized and discussed the research findings to date on the lipid composition and regulation mechanisms of fatty acid deposition and provide new insights into efficient means of improving the lipid composition and lipo-nutritional quality of pork.